what are the names of major groups that settled in the islands of Oceania

chose all answers that are correct

a. south Americans
b. Filipinos
c. aboriginals and Maori
d. Indonesians​

Answer:

intron

Explanation:

To find the number of moles of sodium hydroxide formed from 120 grams, we use the molar mass of NaOH (40 g/mol) and find that it is 3.0 moles.

The student collected 120 grams of sodium hydroxide (NaOH). To calculate the number of moles of NaOH formed, we use the molar mass of NaOH. The molar mass of NaOH is approximately 40 g/mol (23 g/mol for sodium, 16 g/mol for oxygen, and 1 g/mol for hydrogen). Therefore, we can calculate moles using the formula:

Moles = Mass / Molar Mass

By substituting the given values into the formula, we get:

Moles = 120 g / 40 g/mol = 3.0 moles of NaOH

So, the answer to the question is that 3.0 moles of sodium hydroxide were formed in the experiment.

The correct answer is option C. 3.0 moles of NaOH were formed in the experiment.

To find out how many moles of NaOH were formed, we need to use the formula:

[tex]\[ \text{moles of NaOH} = \frac{\text{mass of NaOH}}{\text{molar mass of NaOH}} \][/tex]

The molar mass of NaOH is calculated by adding the molar masses of sodium (Na), oxygen (O), and hydrogen (H). The molar masses are approximately 22.99 g/mol for sodium, 16.00 g/mol for oxygen, and 1.01 g/mol for hydrogen. Therefore, the molar mass of NaOH is:

[tex]\[ \text{moles of NaOH} = \frac{\text{mass of NaOH}}{\text{molar mass of NaOH}} \][/tex]

Now, we can calculate the moles of NaOH produced in the experiment using the given mass of 120 grams:

[tex]\[ \text{moles of NaOH} = \frac{120 \text{ g}}{40.00 \text{ g/mol}} = 3 \text{ moles} \][/tex]

The complete question is:

A student conducted an experiment and combined sodium chloride with magnesium hydroxide to produce sodium hydroxide and magnesium chloride. The student collected 120 grams of NaOH. How many moles of NaOH were formed in the experiment?

Question 1 options:

A) 4800

B) 160

C) 3.0

D) 0.33

Answer:

= 115.898 kJ

Explanation:

Heat evolved in converting 2.00 mol of steam at 150 ∘C to ice at -55.0 ∘C

Will be calculated in steps

Step 1; Heat evolved by steam from 150°C to 100°C

Heat = (2×18) g × 1.84 J/g°C × (150 -100)

       = 3312 Joules

Step 2; Heat required to convert steam to water without change in temperature;

Heat = moles × Molar Latent heat of vaporization.

        =  2 moles × 4.07 ✕ 104 J/mol

        = 8.14 × 10^4 Joules

Step 3: Heat evolved by water  from 100°C to 0°C.

Heat = mass × specific heat capacity × ΔT

        = (2 × 18) × 4.18 J/g°C × 100

        = 15,048 Joules

Step 4; Heat evolved in converting water at 0°C to ice at 0°

Heat = number of moles × molar latent heat of fusion

        = 2 moles × 6000 j/mole

        = 12 000 Joules

Step 5, heat evolved in converting ice at 0°C to -55°C

Heat = mass × specific heat capacity × ΔT

        = (2×18) × 2.09 j/g°C × 55

        = 4138.2 Joules

Total amount of heat evolved;

= 3312 J +  8.14 × 10^4 J + 15,048 J + 12 000 J +  4138.2 J

= 115,898.2 joules

= 115.898 kJ

To find the heat evolved in converting steam to ice, we need to consider the heat absorbed in three steps: heating the steam to 0°C, melting the ice, and finally cooling the water to -55.0°C. The heat evolved is approximately 235.92 kJ.

To find the heat evolved in converting steam to ice, we need to consider the heat absorbed in three steps: heating the steam to 0°C, melting the ice, and finally cooling the water to -55.0°C. We can calculate the heat absorbed in each step using the given heat capacities of steam and ice.

First, we calculate the heat absorbed in heating the steam from 150°C to 0°C. The formula for calculating heat is Q = mcΔT, where Q is the heat, m is the mass, c is the heat capacity, and ΔT is the change in temperature. 

The heat absorbed in heating the steam is Q = (2.00 mol)(18.02 g/mol)(1.84 J/g°C)(0 - 150°C) = -5,232.48 J. Since heat is leaving the system, the heat absorbed is a negative value.

Next, we calculate the heat absorbed in melting the ice at 0°C. The formula for calculating heat is Q = mL, where Q is the heat, m is the mass, and L is the heat of fusion. 

Using the given information, the heat absorbed in melting the ice is Q = (100 g)(2.09 J/g°C) = 209.0 J.

Finally, we calculate the heat absorbed in cooling the water from 0°C to -55.0°C. The formula for calculating heat is Q = mcΔT, where Q is the heat, m is the mass, c is the heat capacity, and ΔT is the change in temperature. 

The heat absorbed in cooling the water is Q = (100 g)(4.18 J/g°C)(-55.0 - 0°C) = -229,900 J. Since heat is leaving the system, the heat absorbed is a negative value.

To find the total heat absorbed in all three steps, we add the heats together: -5,232.48 J + 209.0 J - 229,900 J = -235,923.48 J.

To convert the heat from joules to kilojoules, we divide by 1000: -235,923.48 J / 1000 = -235.92 kJ.

Therefore, the heat evolved in converting 2.00 mol of steam at 150°C to ice at -55.0°C is approximately 235.92 kJ.

Answer:

Check below

Explanation:

The equilibrium here is when water is boiled in a closed circuit.

The point of equilibrium can be described to be the point where there are no opposing forces. At this point, there are no changes anymore.

In the closed circuit for boiling water, no air or water would be able to leave the pot while at the same time no air or water from outside would be able to enter the pot.

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One simple and everyday example of equilibrium is homeostasis in the human body. Despite changes and fluctuations, the body maintains a balance within specific functional ranges. This dynamic balance is also evident in an ecosystem’s ability to reinstate its equilibrium in spite of disturbances, demonstrating their resistance and resilience.

An example of an equilibrium existing in everyday life, which is a state of balance between two opposing processes, can be seen within out personal biology. This is specifically illustrated in the concept of homeostasis in the human body.

Our bodies constantly adjust to internal and external changes through homeostasis ('steady state'). These changes could be in the level of glucose or calcium in our blood or changes in external pressures such as temperature. The body is persistently adjusting to the changes encountered through these process, hence it being a dynamic process.

However, it remains in equilibrium as body functions are kept within a specific range, despite some fluctuations, it's aim is to maintain a balance (set point). So, even an individual that appears inactive is internally maintaining this homeostatic equilibrium.

Another real-life example is within the ecosystem's resistance and resilience. Despite changes in species numbers and occurrences, it manages to maintain a relative constant state of biodiversity. This is its resistance, ability to remain at equilibrium in spite of disturbances. Furthermore, its resilience is shown in its ability to recover its equilibrium state after a disturbance is experienced.

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Answer:

A-B, C-D,E-F , Temperature changes

Explanation:

Answer:Its b and D first person is wrong.

Explanation:

Answer:

Here's what I get.    

Explanation:

What is entropy?

Entropy (S) is often described as a measure of the disorder in a system, but it is really a measure or the number of microstates (W).

A microstate is a specific configuration of the locations of particles and the way that energy is distributed among them.

Entropy is a measure of the degree of the spreading of energy within a system. The more ways that energy can be distributed, the greater the entropy.

Entropy and phase changes

In the solid phase, the particles are in fixed locations and can vibrate slightly about these locations. The number of microstates is relatively small.

If you add energy and convert the solid to a liquid, the particles can slide past each other. The particles have more freedom of motion, so the energy is distributed in more ways. There are more microstates, so S(liquid) > S(solid).

If you add more energy and convert the liquid to a gas, the particles can move in all directions, and the number of microstates (and also S) increases enormously.  

Entropy and number of moles

The more particles you have, the more microstates (ways to distribute the energy) there are.

However, the entropy of gaseous particles far outweighs that of those in solids or liquids.

That's why, when you are asked to predict the sign of ΔS for a reaction, all you need do is calculate the change in the number of moles (Δn) of gases.

If the products contain more moles of gases, ΔS > 0. If the products contain fewer moles of gases, ΔS < 0.

They are all nonmetals

The fluorine, iodine, and chlorine are c) They are similar to noble gases.

Nobel gas refers to those substances which doesn't have any vacant shell. They are completely filled. They are electron haters and are really hard to make them involve in chemical reaction. On the other hand, gases such as chlorine, bromine and iodine are called as halogens. They have ability to accommodate one electron in their valence shell as they have 7 already.

Thus, it can be inferred that gases such as chlorine, bromine and iodine are not similar to Nobel gas and thus the statement C which states they are similar to Nobel gas is considered as false.

Answer:

Barometer.

Explanation:

Answer:

Explanation:

In simplest terms, the fastest moving ones that are closest to the surface.

The particles with the highest kinetic energy are the first to evaporate from a liquid.

Answer: C, an apple staying at rest on the ground.

Explanation: When one or more unbalanced forces are acting on an object, it causes change (eg. the apple falling on the ground would be a result of gravity being stronger than the kinetic energy that the tree is putting on the apple). Even in D, the apple is not moving, but the tree branch is still exerting force to keep the apple hanging there.

PS: I studied net forces last year. Hope this helps!

The populations are isolated and thus do not interbreed.

Answer:B

Answer:

The populations are isolated and thus do not interbreed.

Explanation:

Answer:

- 0.0413°C ≅ - 0.041°C (nearest thousands).

Explanation:

ΔTf = Kf.m,

Where,

ΔTf is the change in the freezing point.

Kf is the freezing point depression constant (Kf = 1.86 °C/m).

m is the molality of the solution.

Molality is the no. of moles of solute per kg of the solution.

∴ molality (m) = no. of moles of solute/kg of solvent = (0.04685 mol)/(2.11 kg) = 0.0222 m.

∴ ΔTf = Kf.m = (1.86 °C/m)(0.0222 m) = 0.0413°C.

∴ The freezing point of the solution = the freezing point of water - ΔTf = 0.0°C - 0.0413°C = - 0.0413°C ≅ - 0.041°C (nearest thousands).

Answer:

MgSO₄(aq) + CaCl₂(aq) → CaSO₄(s) + MgCl₂(aq).

Explanation:

MgSO₄(aq) + CaCl₂(aq) → CaSO₄(s) + MgCl₂(aq).

The products are calcium sulfate and magnesium chloride.

Final answer:

In the reaction between Magnesium Sulfate and Calcium Chloride, a double displacement reaction occurs, forming solid Calcium Sulfate (a precipitate) and Magnesium Chloride in solution.

Explanation:

When Magnesium Sulfate and Calcium Chloride are mixed together in an aqueous solution, a double displacement reaction, also known as a precipitation reaction, occurs. The chemical equation for this reaction is:

MgSO₄(aq) + CaCl₂(aq) → CaSO₄(s) + MgCl₂(aq)

In this reaction, the ions of magnesium and calcium will exchange their respective anions, sulfate, and chloride. This results in the formation of solid Calcium Sulfate (CaSO₄), a precipitate, and Magnesium Chloride (MgCl₂) in aqueous solution.

Answer:

linear

Explanation:

The shape of BCl₂ is linear. The central Be atom has 2 valance electron and so Be has coordination number of 2. In the Be-Cl covalent bond a pair of electron is shared by the Be and the Cl atoms. The bond angle in BeCl₂ is 180°. To account for the bond angle it has been proposed that Be has sp hybridization and each of the two sp hybrid orbital of Be overlaps with the p orbitals of Cl.

The molecular geometry, or shape, of beryllium chloride (BeCl₂) is linear. Therefore, option B is correct.

Beryllium chloride consists of one beryllium atom (Be) bonded to two chlorine atoms (Cl). The beryllium atom has two valence electrons, and it forms two sigma bonds with the chlorine atoms by sharing its electrons.

Since there are no lone pairs of electrons on the central beryllium atom, the molecule adopts a linear geometry, where the two chlorine atoms are arranged in a straight line, with the beryllium atom in the center.

Thus, beryllium chloride has linear geometry.

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it will  produce aluminum hydride and lithium chloride.

AlCl3 + 3LiH → AlH3 + 3LiCl

Answer:

height above sea level---->altitude

continent/ocean-----> geography

latitude---->temperature

moisture available --->rainfall

in ocean-->currents

Explanation: no

Hope this helps!

Correct match pair for altitude is sea level, for continent is geography, for latitude is temperature, for moisture is rain fall and for ocean is currents.

A wind wave, also known as a wind-generated wave, is a water surface wave that occurs on the free surface of bodies of water in fluid dynamics. Wind waves are created when wind blows across a fluid surface.

Hence correct matches are shown above.

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Answer : The correct option is, [tex]Fe^{2+}(aq)+2e^-\rightarrow Fe(s)[/tex]

Explanation :

Redox reaction or Oxidation-reduction reaction is the reaction in which the oxidation and reduction reaction takes place simultaneously.

Reduction reaction : The reaction in which a substance gains electrons. In this, oxidation state of an element decreases. Or we can say that in reduction, the gain of electrons takes place.

Oxidation reaction : The reaction in which a substance looses its electrons. In this, oxidation state of an element increases. Or we can say that in oxidation, the loss of electrons takes place.

The given balanced chemical reaction is :

[tex]Mg(s)+Fe^{2+}(aq)\rightarrow Mg^{2+}(aq)+Fe(s)[/tex]

The oxidation-reduction half reaction will be :

Oxidation : [tex]Mg\rightarrow Mg^{2+}+2e^-[/tex]

Reduction : [tex]Fe^{2+}+2e^-\rightarrow Fe[/tex]

In this reaction, the oxidation state of 'Mg' changes from (0) to (+2) that means Mg lost 2 electrons and it shows oxidation and the oxidation state of 'Fe' changes from (+2) to (0) that means Fe gains 2 electrons and it shows reduction.

Therefore, the correct option is, [tex]Fe^{2+}(aq)+2e^-\rightarrow Fe(s)[/tex]

Answer: Thyroid disorders can range from a small, harmless goiter (enlarged gland) that needs no treatment to life-threatening cancer. The most common thyroid problems involve abnormal production of thyroid hormones. Too much thyroid hormone results in a condition known as hyperthyroidism.

Explanation:

Answer:

Hyperthyroidism and hypothyroidism.

Explanation:

Hyperthyroidism and hypothyroidism are thyroid diseases that affect women the most.

Hyperthyroidism (ICD 10 - E05) is a problem in which the thyroid gland produces excess hormones, which impacts on various body functions. Here the gland is overactive, that is, it works in excess. Hyperthyroidism occurs when the thyroid produces large amounts of these hormones in a short (acute) or long (chronic) period of time.

Hypothyroidism is, in short, a decrease in the production of thyroid hormones - triiodothyronine (T3) and thyroxine (T4). It is the most common disorder of this gland, which is in the neck area and resembles a butterfly. Its performance reverberates throughout the body, interfering in the heartbeat, the rhythm of the intestine, the mood and the menstrual cycle of women. The release of thyroid substances is orchestrated from the pituitary gland, a structure that is there in the brain.

Answer:

C. A neutron turns into a proton

D. An electron is ejected from the nucleus

Explanation:

In beta decay, a neutron within an atom's nucleus converts into a proton, and an electron is ejected from the nucleus. The correct descriptions of beta decay from the list are C and D.

From the list provided, the items that describe beta decay are:

C. A neutron turns into a proton

D. An electron is ejected from the nucleus

Beta decay is a radioactive process where a nucleus transforms to become more stable. During this process, a neutron converts into a proton plus an electron. This electron, also known as a beta particle, is then ejected from the nucleus at high speed. Although the neutron turns into a proton, the overall mass of the atom remains relatively constant as the mass of an electron is negligible compared to that of a neutron or a proton.

Option B is incorrect because beta decay relates to the ratio of neutrons to protons, not the comparison of neutrons to electrons. Option A is also incorrect because beta decay occurs in unstable atoms, not stable ones.

As pressure increases volume decreases

As temperature increases pressure increases

As volume increases temperature increases

Explanation:

in the first statement as pressure increases it compresses the volume of the object decreasing it

In the second statement when temperatures increase so does the pressure like when you heat a closed bottle or placed hot water in and you try to open it,it tends to burst

In the third statement when volume increases temperature also increases because it expands when heated

Answer:

Rogue waves could safely be classified alongside mermaids and sea monsters. ... A rogue wave is one that is at least twice the "significant wave height", which refers to the average of the third highest waves in a given period of time Rogues, called 'extreme storm waves' by scientists, are those waves which are greater than twice the size of surrounding waves, are very unpredictable, and often come unexpectedly from directions other than prevailing wind and waves.

Most reports of extreme storm waves say they look like "walls of water." They are often steep-sided with unusually deep troughs.

Since these waves are uncommon, measurements and analysis of this phenomenom is extremely rare. Exactly how and when rogue waves form is still under investigation, but there are several known causes:

Constructive interference. Extreme waves often form because swells, while traveling across the ocean, do so at different speeds and directions. As these swells pass through one another, their crests, troughs, and lengths sometimes coincide and reinforce each other. This process can form unusually large, towering waves that quickly disappear. If the swells are travelling in the same direction, these mountainous waves may last for several minutes before subsiding.

Focusing of wave energy. When waves formed by a storm develop in a water current against the normal wave direction, an interaction can take place which results in a shortening of the wave frequency. This can cause the waves to dynamically join together, forming very big 'rogue' waves. The currents where these are sometimes seen are the Gulf Stream and Agulhas current. Extreme waves developed in this fashion tend to be longer lived.

Explanation:

carries instruments aloft to send back information on atmospheric pressure, temperature, humidity and wind speed by means of a small, expendable measuring device called a radiosonde.

Weather balloons carry a radiosonde that provides essential data for weather prediction by sending back information on atmospheric conditions as it ascends to the stratosphere. This data is critical not only for daily weather reports but also for severe weather predictions. Satellites complement these observations by tracking larger atmospheric patterns.

Weather balloons play a crucial role in the systematic collection of weather data. These balloons carry a radiosonde that ascends through the atmosphere and transmits valuable information about atmospheric conditions such as temperature, pressure, humidity, and wind speed. Carried into the stratosphere, these balloons encounter different layers of the atmosphere, providing detailed, vertical profiles that are essential for meteorologists to predict the weather.

Since their conception over 70 years ago, weather balloons have proven to be an indispensable tool for meteorologists. Beyond compiling everyday weather reports, the data collected by these balloons is crucial for predicting severe weather events such as hurricanes or flooding.

The combination of data from weather balloons, satellites, and radar enables comprehensive monitoring of weather patterns. While satellites monitor large sections of the atmosphere and track various environmental elements, weather balloons provide localized, vertical data that is critical for an in-depth understanding of weather phenomena. Together, they form a synergistic network for global weather observation.

Final answer:

Two tasks that illustrate the importance of precision in measurement are the casual mixing of a cleaning solution, which requires less precision, and a titration procedure in a chemistry lab, where accurate stoichiometry and quantitative chemical analysis are crucial for determining the concentration of the analyte.

Explanation:

When considering differing requirements for measurement in chemical reactions, we can compare two tasks: one where precision is not critical and another where exact stoichiometry and laboratory protocol are essential.

For a task where measurement is not critical, consider mixing a cleaning solution where the exact concentrations are not vital. Small deviations in the amount of detergent or water will not significantly affect the cleaning ability of the solution. This demonstrates a scenario where "good enough" suffices.

On the contrary, precise measurements are indispensable in a task such as a titration in a chemistry lab. In a titration, a known concentration of one solution (titrant) is added to a known volume of another solution (analyte) until the chemical reaction is complete, indicated by a color change or another marker. The volume of titrant used must be measured precisely as it's used to calculate the exact concentration of the analyte. This task necessitates careful quantitative chemical analysis, as any inaccuracy could significantly affect the validity of the results.

there isn't anything here to answer

Answer:

Boyle's law (PV = k)

-When the size of an air chamber is increased, the air pressure decreases.

-Pressing on an inflated balloon decreases its size.

Charles's law (V/T = k)

-A closed, flexible container expands when its heated.

-A balloon shrinks when it's taken outside in the winter.

Avogadro's law (V/n = k)

-A balloon expands when air is blown into it.

B is fasho the answer thank me later, It's not C because it can be used as a drying agent but not all hygroscopic substances are Drying agents and It also can be A

Answer:

Explanation:

It is D. All of the above

Answer:

Conclusion

Explanation:

I believe you were asking for the term that best matches with the description given. Typically the conclusion summarizes your experiment in a 1 to 2 paragraph format.

Final answer:

The conclusion section of a scientific paper is crucial for summarizing experimental findings, interpreting results in the context of the experiment's aims, discussing shortcomings, and recommending further research. It should address the original hypothesis and contemplate improvements for future experiments.

Explanation:

The conclusion section of a scientific paper is vital as it summarizes the importance of the experimental findings. A conclusion should clearly describe the purpose of the experiment, discuss the major findings, offer a brief explanation of these findings, and present recommendations for further study. When drafting the conclusion, it's essential to answer the original question posed by the experiment, using the results obtained. The conclusion should also highlight any shortcomings of the experiment and suggest what could be changed or extended in future research, such as collecting more data for better statistical analysis or modifying the experimental method.

The conclusion is not just a summary but serves to interpret the results in the context of the experiment's aims. If the experiment was designed to test a hypothesis, the conclusion should state whether the findings support it. Furthermore, the conclusion might also raise new questions that emerged from the study, suggest areas for further research, and identify any systematic errors or unexpected insights about the subject matter or the scientific method in general. Reflecting on what could be improved if the experiment were to be redone is also a valuable part of the concluding section.

Answer:

A

Explanation:

Although rounding is needed, this answer makes the most sense.

If the question is (2.5 x 10^3) + (3.5 x 10^2):

= (2.5 x 1000) + (3.5 x 100)

=(2500) + (350)

= 2850.

Taking out the 10^3 with scientific notation leaves us with 2.85 x 10^3. Because this isn't an answer choice, A is the closest.

To find the sum of 2.5 x 10^3 and 3.5 x 10^2, both numbers must be expressed with the same exponent, which leads to the result of 3.75 x 10^4. None of the provided options match this result, suggesting there may be an error in the original question or answer choices.

To add 2.5 x 10^3 and 3.5 x 10^2, we need to express both numbers with the same exponent. Here's how we do it step-by-step:

Recognize that 10^3 is the same as 1000 and 10^2 is the same as 100.

Convert 3.5 x 10^2 to a number with an exponent of 3: (3.5 x 10^2) x 10 = 35 x 10^2.

Add the two numbers together: (2.5 x 10^3) + (35 x 10^2).

Since both numbers now have the same exponent, combine the coefficients: 2.5 + 35 = 37.5.

Finally, express the sum as a scientific notation: 37.5 x 10^3.

This simplifies to 3.75 x 10^4 when we adjust the coefficient to keep the number in scientific notation form. However, this result is not listed in the provided options. It seems there might be a mistake in the question or the answer choices. Please double-check the question and the options.

Answer:

Polymerization

Explanation:

Several natural and man-made organic compounds are enormous molecules which contains hundreds of thousands of atoms per molecule.

The giant molecules formed are produced through the process of polymerization.

Polymerization is the linking of monomers through chemical reactions to form long chain polymer molecules.

Monomers are small molecules that are joined to form polymers.

Synthetic plastics are derieved from synthetic polymers. These synthetic materials are very useful and vital due to their great size. Their size premits a certain complexity of structure which makes the molecules disposed in a regular pattern with respect to one another. They stretch out nearly to alongside of one another or coil up independently. The polymerization of monomers to form plastics fosters the various uses these giant molecules are put to.

Answer:

polymerization.

Explanation:

32g/mol. The molar mass of an oxygen atom is ~15.999995, which is pretty much 16. Since oxygen is diatomic, you would multiply the molar mass of one atom by two (16 x 2) to get 32 g/mol

Answer: 32 g/mol

Explanation:

According to Avogadro's law, 1 mole of every substance contains avogadro's number [tex](6.023\times 10^{23})[/tex] of particles and weighs equal to its molecular mass.

Diatomic molecule is a molecule formed by combination of two atoms of the same element. Example: [tex]O_2[/tex]

1 mole of oxygen [tex]O_2[/tex] molecule contains = 2 moles of oxygen atoms

1 mole of oxygen atom weigh= 16 g

2 moles of oxygen atoms weigh =[tex]\frac{16}{1}\times 2=32 g[/tex]

Thus 1 mole of oxygen molecule weigh 32 g.