Answer:
D to absorbe energy from the sun's radiation to heat wats
Final answer:
Solar panels can utilize photovoltaics to generate electricity directly, or solar thermal technology to heat water in a house, with option D being the correct usage in the context of heating water.
Explanation:
Solar panels in a house can be used in various ways to harness solar energy. One of the methods is through photovoltaics, which convert sunlight directly into electricity that can be used to power a home's appliances and lighting. Another method is solar thermal technology, which can absorb the Sun’s energy to heat water or air for domestic use. For the question at hand, the correct answer is option D: to absorb energy from the sun’s radiation to heat water. Solar panels absorb electromagnetic waves, particularly visible light and infrared radiation, which is then converted into thermal energy. This thermal energy can be used to heat water in a residential setting, contributing to the home's hot water supply or heating system, and reducing reliance on conventional energy sources.
Name another career that combines science with another interest .
Answer Archeology
Explanation:
You like to dig holes? ARCHEOLOGY
how can you tell if your friends are fake or not
Answer:
you ask them a couple of questions like what would u do in this problem and see their answer
Explanation:
Honestly I'm going through a lot of fake friends right now and I don't have the guts to tell them off cause I feel bad. But a way to see if there fake is if they usually don't want to hang out with you or always change the plans, or just act like your friends when they want something such as buying them stuff, giving them money, or just wanting something. Another way to test is if they do everything they can to give you as little as possible. If they do stuff like this just stop talking to them or try to get away from what they want or ditch them and tell them their fake.
Which of these changes most likely results in an increase in the volume of a gas?
ma
Answer:
ok so you take the volume then divide it by the pressure, and subtract the area to find the rough estimate. but your probably looking for an exact answer so you take that and then do that when you get that thatll be that.
Explanation:
Decreasing the pressure on the gas will most likely result in an increase in the volume of a gas.
What is pressure?Pressure is defined as the force applied on an object perpendicular to it's surface per unit area over which it is distributed.Gauge pressure is a pressure which is related with the ambient pressure.
There are various units by which pressure is expressed most of which are derived units which are obtained from unit of force divided by unit of area . The SI unit of pressure is pascal .
It is a scalar quantity which is related to the vector area element with a normal force acting on it.It is distributed over solid boundaries and across arbitary sections of fluid normal to the boundaries at every point.
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When energy is changed from one form to another, _____.
A. a physical change occurs
B. all of the energy can be accounted for
C. some of the energy is lost entirely
D. all of the energy is changed to a useful form
(please explain why)
Answer:
Since energy cannot be created or destroyed and it can only change form or be transferred from one object to another.
The total amount of energy and matter in the Universe remains constant, merely changing from one form to another. The First Law of Thermodynamics (Conservation) states that energy is always conserved, it cannot be created or destroyed. In essence, energy can be converted from one form into another.
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The correct option is option B. All of the energy can be accounted for.
According to the energy conservation principle, no matter how energy is transformed, its overall quantity never changes. Energy can only be changed from one form to another; it cannot be created or destroyed. The law of conservation of energy is the term used to describe this idea.
According to the law of conservation of energy, the total energy before and after conversion is the same.
Therefore, all of the energy involved in a transformation can be accounted for.
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What purpose do cooling towers serve in a nuclear power plant?
A. to retain the nuclear gases emitted from the nuclear reactions
B. to provide a location for the heated water to cool and condense
C. to maintain the high temperatures required for the nuclear reactions
D. to act as a barrier to contain radiation in case of a possible meltdown
Answer:
B
Explanation:
Cooling towers provide an energy efficient and environmentally friendly way of removing heat from this circulating water before it is returned to its source.
A balloon is filled with 2000 mL of air at a pressure of 2 atm. What is the volume of the balloon if the pressure is
changed to 5 atm?
Answer:
800mL
Explanation:
Using Boyle's law which states that the volume of a given mass of gas is inversely proportional to the pressure, provided temperature remains constant
P1V1= P2V2
P1 = 2 atm, V1 = 2000mL ,
P2 = 5atm , V2 = ?
2 × 2000 = 5 × V2
Divide both sides by 5
V2 = 4000 ÷ 5
V2 = 800mL
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Final answer:
The volume of a balloon filled with 2000 mL of air at 2 atm will change to 800 mL when the pressure is increased to 5 atm, as per Boyle's Law, which states that pressure and volume are inversely proportional for a gas at constant temperature.
Explanation:
The principles of gas laws, specifically Boyle's Law, which implies that for a given mass and constant temperature of an ideal gas, the pressure and volume are inversely proportional. We can set up a direct application of Boyle's Law where P1 * V1 = P2 * V2. Given that a balloon is filled with 2000 mL of air at a pressure of 2 atm (P1 and V1), we want to find the new volume (V2) if the pressure is changed to 5 atm (P2).
Using the formula, we can solve for V2 as follows:
V2 = (P1 * V1) / P2
V2 = (2 atm * 2000 mL) / 5 atm
V2 = 4000 mL atm / 5 atm
V2 = 800 mL
Therefore, the volume of the balloon when the pressure is increased to 5 atm is 800 mL.
Which type of radioactive decay only releases energy?
A gamma rays
B beta particles
C helium nucleus
D alpha particles
Answer:
A gamma rays
Explanation:
Gamma rays unlike beta and alpha particles releases energy and they are actual rays and not particles.
A gamma ray is form of electromagnetic radiation with no mass and charge. Its energy could range from 10KeV to 3MeV.
Its range is not definite in any medium but much longer than those of alpha and beta particles. Intensity of the rays diminishes exponentially from the source.
Temperature is ____ related to the average kinetic energy of a gas.
inversely
directly
not
disproportionally
Answer:
directly
Explanation:
Temperature is defined as the average kinetic energy per particle of a gas, hence temperature and average kinetic energy are directly related meaning that if kinetic energy of a gas increases temperature will also increase.
which of the following describes resistance?
completely stops electron flow
impedes the flow of electrons
is an insulator
has to do with the voltage in the circuit
Answer:
impedes the flow of electrons
Explanation:
When electricity flowing in a circuit, that means the electron is flowing there too. All objects have resistance which tells how much the material impedes the flow of electron, which in turn will lower the current flowing on the circuit. It won't stop the flow completely. Material with high resistance will be called insulator and material with low resistance called a conductor.
How much heat must your body transfer to 500.0g of water to heat it from 25.0°C to body temperature, 37.0°C?
Answer : The heat your body transfer must be, 25.1 kJ
Explanation :
Formula used :
[tex]Q=m\times c\times \Delta T[/tex]
or,
[tex]Q=m\times c\times (T_2-T_1)[/tex]
where,
Q = heat = ?
m = mass of water = 500.0 g
c = specific heat of water = [tex]4.18J/g^oC[/tex]
[tex]T_1[/tex] = initial temperature = [tex]25.0^oC[/tex]
[tex]T_2[/tex] = final temperature = [tex]37.0^oC[/tex]
Now put all the given value in the above formula, we get:
[tex]Q=500.0g\times 4.18J/g^oC\times (37.0-25.0)K[/tex]
[tex]Q=25080J=25.1kJ[/tex]
Therefore, the heat your body transfer must be, 25.1 kJ
(DUE 4:00 AM PLEASE HELP!)
Carbon has an atomic number of 6 and an atomic mass of 12.011.
Carbon-12, Carbon-13, and Carbon-14 are all isotopes of carbon.
What is the difference between those three isotopes?
Answer:
Explanation:
Isotopes, by definition, are a set of elements having the same Atomic No. (# protons) but different Atomic Masses due to variations in number of neutrons.
Isotope #p⁺ #n° #e⁻ (neutral element)
C-12 6 6 6
C-13 6 7 6
C-14 6 8 6
Determine the molecular formula of decene, which has an empirical formula of CH2 and a molar mass of 140.27 g/mol.
Answer:
Molecular formula = C₁₀H₂₀
Explanation:
Given data:
Empirical formula = CH₂
Molar mass = 140.27 g/mol
Molecular formula = ?
Solution:
Molecular formula = n (empirical formula)
n = molar mass of compound / empirical formula mass
Now we will calculate the empirical formula mass.
CH₂ = 12 × 1 + 1× 2
CH₂ = 12 +2
CH₂ = 14
n = 140.27 / 14
n = 1 0
Molecular formula = n (empirical formula)
Molecular formula = 10 (CH₂)
Molecular formula = C₁₀H₂₀
A man weighing 75 kg takes 5 minutes to reach a height of 5 m when he climbs a staircase. What is his power?
A) 1.250 W
B) 12.25 W
C) 31.25 W
D) 61.25 W
Answer: B. 12.25 W
please give brainliest!
Explanation:
1) Force = Weight = 75 x 9.8 = 735 N
2.)Work = Force x Height = 735 x 5 = 3675 J
3.)Power = Work / Time = 3675 / (5 x 60) = 12.25 W
If I have 21 liters of gas held at a pressure of 78 atm and a temperature of 900 K, what will
be the volume of the gas if I decrease the pressure to 45 atm and decrease the
temperature to 750 K?
Answer:
30.33L
Explanation:
Using Boyle's law which states that the volume of a given mass of gas is inversely proportional to the pressure, provided temperature remains constant and Charles law states that the volume of a given mass of gas is directly proportional to the temperature provided the pressure remains constant
P1V1/T1 = P2V2/ T2
P1 = 78atm, V1 = 21L , T1 = 900K
P2 = 45atm, V2 = ? , T2 =750K
78× 21 / 900 = 45×V2 / 750
1638/900 = 45 V2 / 750
1638×750 = 900×45V2
1228500 = 40500V2
Divide both sides by 40500
1228500÷40500= V2
V2 = 30.33L
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Using the combined gas law, we determined the final volume of the gas to be 30.33 liters.
To solve this problem, we'll use the combined gas law, which is expressed as:
(P₁ * V₁) / T₁ = (P₂ * V₂) / T₂
Here, P₁, V₁, and T₁ are the initial pressure, volume, and temperature, and P₂, V₂, and T₂ are the final pressure, volume, and temperature.
We are given the following values:
P₁ = 78 atm
V₁ = 21 liters
T₁ = 900 K
P₂ = 45 atm
T₂ = 750 K
We need to find V₂. Rearrange the combined gas law to solve for V₂:
V₂ = (P₁ * V₁ * T₂) / (T₁ * P₂)
Substitute the given values into the equation:
V₂ = (78 atm * 21 liters * 750 K) / (900 K * 45 atm)
Calculate the result step-by-step:
78 * 21 = 1638
1638 * 750 = 1228500
900 * 45 = 40500
V₂ = 1228500 / 40500 = 30.33 liters
Therefore, the final volume, V₂, is 30.33 liters.
explain why alchemy is not as reliable as modern day science
Answer:
Explanation:
Alchemy is the forerunner of modern chemistry practiced during the medieval times. Chemists of those times were known and called alchemists.
These chemists had a very shallow knowledge of chemistry but were able to produce a wide range of chemicals.
Alchemy predates the scientific method. Modern science is investigative and relies on the precepts of detailed and methodical process. Modern day chemistry is a vertiginous study with more depth. It seeks to provide details into reasons why certain chemical matter exists as they are. Or how combinations in reactions takes place. Alchemy does not follow the scientific method in its investigationNickel is extracted from nickel oxide by reduction with carbon.
Explain why carbon can be used to extract nickel from nickel oxide.
Answer:
Nickel is extracted from nickel oxide by reduction with carbon. Nickel is a metal which react with atmospheric oxygen which is very reactive in order to protect the inner surface of metal. Carbon extract oxygen which is attached to the nickel in the form of nickel oxide because carbon is more reactive so it made a chemical bonds with oxygen and nickel oxide is converted into a pure nickel.
Carbon is used to extract nickel from nickel oxide because carbon acts as a reducing agent. During the reduction reaction, carbon reacts with nickel oxide to form nickel and carbon dioxide. Carbon's greater affinity for oxygen allows it to remove oxygen from nickel oxide, leaving nickel.
Explanation:Carbon can be used to extract nickel from nickel oxide because of its ability to act as a reducing agent. In this context, a reducing agent is a substance that donates electrons to another substance, in this case, nickel oxide. This reduction reaction involves carbon reacting with nickel oxide to form nickel and carbon dioxide. Carbon, having a greater affinity for oxygen than nickel, binds with the oxygen in the nickel oxide forming carbon dioxide and leaving the nickel behind. This process is commonly used in metal extraction from their oxides, especially those of less reactive metals like nickel.
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I need some help please
look on google calculator
If 1.13 x 104 J of heat is added to a water sample and the temperature rises from 88.0 ºC to its boiling point, what mass of water is in the sample?
A. 225 g
B. .255 g
C. 2.55 g
D. 25 g
Answer:
c
Explanation:
heatmass*density*temp. difference=
In the sample, the mass of water is "225 g".
Given:
Heat energy,
[tex]Q = 1.13\times 10^4 \ J[/tex]Specific heat,
[tex]c = 4.186 \ J/g.^{\circ} C[/tex]The change in temperature,
[tex]\Delta T =boiling \ point - 88.0^{\circ} C[/tex][tex]= 100-88[/tex]
[tex]= 12 ^{\circ} C[/tex]
As we know,
→ [tex]Q = mc \Delta T[/tex]
→ [tex]1.13\times 10^4=m\times 4.186\times 12[/tex]
→ [tex]m = \frac{1.13\times 10^4}{4.186\times 12}[/tex]
→ [tex]= 224.956 \ g[/tex]
or,
→ [tex]= 225 \ g[/tex]
Thus the answer above is appropriate.
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5. How many grams of cobalt are in 1.52 x 1024 atoms of cobalt?
149 g of cobalt are present in 1.52 x [tex]10^{24}[/tex] atoms of cobalt.
Explanation:
One mole of an atom is equal to the Avagadro number of the atom.
[tex]1 \ mol \ of \ Co = 6.023\times10^{23} atoms\ of \ Co[/tex]
The number of atoms per mol is divided by the given atoms of Cobalt.
= [tex](1.52 \times 10^{24}) \times[/tex] [tex]\frac{1 \ mol\ Co}{6.023 \times10^{23}\ atoms\ Co}[/tex]
= 2.52 mol of Co
To covert, the moles into grams multiply the mole value by its molar mass
The Molar mass of Cobalt is 58.93
= 2.52 [tex]\times[/tex] 58.93
= 149 g.
Using Avogadro's number and the molar mass of cobalt, one can calculate that 1.52 x 10²24 atoms of cobalt equates to approximately 148.51 grams of cobalt.
Explanation:To determine how many grams of cobalt are in 1.52 x 1024 atoms of cobalt, we need to use Avogadro's number and the molar mass of cobalt. Avogadro's number tells us that there are 6.022 x 1023 atoms in one mole of any substance. The molar mass of cobalt (Co) can be found on the periodic table, and it is about 58.93 grams per mole.
The calculation, similar to conversions seen in examples given, would be as follows:
Determine how many moles of cobalt the given number of atoms represents: (1.52 x 1024 atoms Co) / (6.022 x 1023 atoms/mole) = 2.52 moles CoConvert moles of cobalt to grams using the molar mass of cobalt: 2.52 moles Co x 58.93 g/mole = 148.51 grams CoTherefore, there are 148.51 grams of cobalt in 1.52 x 1024 atoms of cobalt.
What does a wave do?
O
A. It repels charges that are alike.
O
B. It converts matter into energy.
C. It attracts particles over a distance.
O
D. It moves energy through space.
SUBMIT
Answer:
D. It moves energy through space
Explanation:
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We dissolve 5g of sugar, C12H22O11, in water to make 1L solution. What is the concentration of this solution expressed as molarity.
Answer: M = 0.01 M C12H22O16
Explanation: First convert the mass of C12H22O16 into moles using the molar mass of the compound.
5 g C12H22O16 x 1 mole C12H22O16 / 342 g C12H22O16
= 0.01 mole C12H22O16
To calculate the molarity we will use the following formula.
M = n / L
= 0.01 mole / 1 L
= 0.01 M C12H22O16
Final answer:
To find the molarity of a sugar solution with 5g of sucrose in 1L of water, calculate the moles of sucrose and divide by the volume. The molarity of this solution is 0.01 M C12H22O16
Explanation:
The question asks to find the molarity of a sugar solution which is made by dissolving 5g of sucrose (C12H22O11) in enough water to make a 1L solution. First, we need to find the molar mass of sucrose, which is the sum of the atomic masses of its constituent elements: 12 carbons, 22 hydrogens, and 11 oxygens. The molar mass of sucrose is (12 × 12.011) + (22 × 1.008) + (11 × 15.999) = 342.30 g/mol. Now, we calculate the number of moles of sucrose present in 5g and then divide by the volume of the solution in liters to get the molarity.
First convert the mass of C12H22O16 into moles using the molar mass of the compound.
5 g C12H22O16 x 1 mole C12H22O16 / 342 g C12H22O16
= 0.01 mole C12H22O16
To calculate the molarity we will use the following formula.
M = n / L
= 0.01 mole / 1 L
= 0.01 M C12H22O16
At equilibrium the partial pressures of N2O4 and NO2 are 0.35 atm and 4.3 atm. What is the Kp
The equilibrium constant, Kp, can be calculated using the formula Kp = (PNO2)^2 / PN2O4, where PNO2 and PN2O4 are the partial pressures of NO2 and N2O4 at equilibrium. In this case, the given partial pressures are 0.35 atm and 4.3 atm, respectively. By substituting these values into the formula, we find that Kp is approximately 52.37.
Explanation:The equilibrium constant, Kp, is a measure of the ratio of the product pressures to the reactant pressures at equilibrium. In this case, we are given the partial pressures of N2O4 (0.35 atm) and NO2 (4.3 atm) at equilibrium. Since Kp is defined as the ratio of product pressures to reactant pressures, we can calculate Kp using the formula Kp = (PNO2)2 / PN2O4.
Substituting the given values into the formula gives Kp = (4.3)2 / 0.35 = 52.37. Therefore, the equilibrium constant Kp is approximately 52.37.
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The equilibrium constant (Kp) for the equilibrium between [tex]NO_2[/tex] and [tex]N_2O_4[/tex] with given partial pressures is 0.0189.
The degree of thermodynamic activity of a gas corresponds to its partial pressure.
To calculate the equilibrium constant (Kp) for the reaction 2 [tex]NO_2[/tex](g) = [tex]N_2O_4[/tex] (g), we use the following equilibrium expression:
[tex]Kp = (PN_2O_4) / (PNO_2)2[/tex]
Given the partial pressures at equilibrium, [tex]PN_2O_4 = 0.35[/tex] atm and [tex]PNO_2 = 4.3[/tex] atm, we can substitute these values into the equation to find the Kp:
Kp = (0.35) / (4.3)2
After squaring the partial pressure of [tex]NO_2[/tex] and dividing by the partial pressure of [tex]N_2O_4[/tex], we get:
Kp = 0.35 / 18.49
Kp = 0.0189 (to four significant figures)
Identify each definition that applies to the compound in red. Check all that apply.
Arrhenius acid
Bronsted-Lowry acid
Arrhenius base
Bronsted-Lowry base
Answer:
C. Bronsted-Lowry base
Explanation:
Also the same answer is for...
The compound given in red Mg(OH)2 is Option(C) Arrhenius base and Option(D) Bronsted-Lowry base.
What is Arrhenius and Bronsted-Lowry theory ?Arrhenius theory states that acids are substances that dissociate in water to yield electrically charged atoms or molecules, called ions, one of which is a hydrogen ion (H+), and that bases ionize in water to yield hydronium ions (OH−).
According to Bronsted-Lowry theory, acid is a substance which donates an H+ ion and forms its conjugate base and the base is a substance which accepts an H+ ion and forms its conjugate acid.
Checking the compound in red, Mg(OH)2 -The compound given Magnesium Hydroxide Mg(OH)2 is an Arrhenius base therefore it is also a Bronsted-Lowry base. Magnesium Hydroxide accepts the hydronium ion from the product thereby forming the conjugate acid. Magnesium Hydroxide also dissolves in water in neutral medium to yield hydronium ions (OH−).
Therefore, the compound given in red Mg(OH)2 is Option(C) Arrhenius base and Option(D) Bronsted-Lowry base.
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Question 17 of 25
4 Points
The law of conservation of mass states that in a chemical reaction, matter is
not created or destroyed.
O
A. True
O
B. False
Answer:
Why would it be false? That would be a great magic act.
Explanation:
What is the mass of a piece of iron if it absorbs 5575 joules of heat and its specific heat capacity is 0.95 J/g°C? The initial temperature of the iron is 20.0°C and is raised to 30°C.
Only include numbers and the decimal point in your answer. If necessary, round to the hundredths (two spots to the right of the decimal point) place. For example "34.22."
Answer:
The mass of iron piece = 586.84
Explanation:
Given,
Heat absorbed by iron piece(Q) = 5575 Joules.
specific heat capacity(Cp) = 0.95 J/g°C.
initial temperature(T₁) = 20.0°C
Final temperature(T₂) = 30.0°C
Mass of iron piece(m) = ?
The mass of iron piece can be calculated by using the formula ,
Q = (mass) (ΔT) (Cp)
Here, ΔT = T₂ - T₁ = 30°C - 20°C = 10°C
Substituting values we get,
5575 = (m)(10)(0.95)
Solving, we get,
m = 586.84 grams.
Therefore, mass of iron piece = 586.84 grams.
More than three fourths of the air we breathe is oxygen
Answer:
False.
Explanation:
The Earth's atmosphere is composed of 78% Nitrogen & 21% Oxygen. The other 1% varies.
Determine the temperature (in K) of 1.5 moles of gas contained in a 5.5 L vessel at a pressure of 192.4 kPa.
Answer:
84.96K
Explanation:
The following were obtained from the question:
n = 1.5 mole
V = 5.5L
P = 192.4 kPa = 192400Pa
Recall
101325Pa = 1atm
192400Pa = 192400/101325 = 1.9atm
R = 0.082atm.L/K /mol
T=?
We can obtain the temperature by applying the following:
PV = nRT
T = PV / nR
T = (1.9 x 5.5)/(1.5 x 0.082)
T = 84.96K
PLEASE ANSWERRRRRR
Travels faster through air than metal.
electromagnetic wave, mechanical wave, or both.
Electromagnetic wave travels faster through air than metal.
Option A
Explanation:
There are different kinds of wave energy. The most significant are electromagnetic and mechanical waves. The mechanical waves propagate through the medium by transfer of energy by vibrating of particles in medium.
So, the more number of particles present in the medium, the more fast the mechanical wave can propagate. So the mechanical waves travel faster in metals consisting of more number of free charge carriers. But electromagnetic waves does not need any of the medium to propagate. So it can travel faster in air than in metals.
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The table below shows the depths at which an index fossil and three other fossils were found.
Fossil Data
Fossil Depth (meters)
A 294
B 365
C 375
Index fossil 460
Which statement is correct?
Fossil B is older than the index fossil.
The index fossil is younger than Fossil C.
Fossil A is younger than the index fossil.
The index fossil is the same age as Fossil C.
Answer:
The Correct Answer is C
Fossil A is younger than the index fossil.
Explanation:
Fossil A is younger than the index fossil is correct statement. Hence option 3 is correct.
What are fossils?Fossils are defined as an animal or plant relic, impression, or trace that has survived in the Earth's crust over time. A living object, such an animal or plant, dies and is quickly buried by debris, like mud, sand, or volcanic ash, which results in the creation of fossils. Important evidence for evolution and the environmental adaptation of plants and animals can be found in fossils.
Index fossils are fossils that are common yet were only present for a brief time. By comparing a rock layer to other rock layers, index fossils enable scientists to determine the relative age of a rock layer. Organisms that are still alive today yet have undergone little alteration over millions of years are known as living fossils.
Thus, fossil A is younger than the index fossil is correct statement. Hence option 3 is correct.
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4.00 g of sodium and 2.00 g of oxygen react according to the following balanced equation 4 Na + O2 → 2 Na2O Calculate the mass of Na2O that can be produced by this reaction
The mass of Na₂O produced from the reaction of 4.00 g of sodium with 2.00 g of oxygen is 5.39 g, using stoichiometry and molar mass conversions.
Reaction Stoichiometry and Mass Calculations
To calculate the mass of Na₂O produced from 4.00 g of sodium (Na) and 2.00 g of oxygen (O₂), first, we need to convert the mass of the reactants to moles using their molar masses. The molar mass of sodium is approximately 23 g/mol, and for oxygen (O₂), it is about 32 g/mol. As a result, we have:
4.00 g Na times (1 mol Na / 23 g Na) = 0.174 mol Na
2.00 g O₂ times (1 mol O₂ / 32 g O₂) = 0.0625 mol O₂
From the balanced equation, 4 moles of Na react with 1 mole of O₂ to produce 2 moles of Na₂O. This indicates that sodium is the limiting reagent since fewer moles of it are available relative to the stoichiometric requirements. Thus, we can calculate the amount of Na2O produced:
0.174 mol Na times (1 mol Na₂O / 2 mol Na) = 0.087 mol Na₂O
The last step is to convert moles of Na2O to grams using its molar mass (Na₂O has a molar mass of approximately 62 g/mol):
0.087 mol Na₂O times (62 g Na₂O / 1 mol Na₂O) = 5.39 g Na₂O
Therefore, 5.39 g of Na₂O can be produced by the reaction of 4.00 g of sodium with 2.00 g of oxygen.