What is the absorbance of the permanganate in the diluted waste solution?
Reaction has a theoretical yield of 56.9 g. when the reaction is carried out, 36.6 g of the product is obtained.
The percent yield of the reaction is 64.25%.
Explanation:The percent yield of a chemical reaction is the ratio of the actual yield (the amount of product obtained) to the theoretical yield (the amount of product that could be obtained based on the balanced chemical equation), multiplied by 100. In this case, the theoretical yield is 56.9 g and the actual yield is 36.6 g. To calculate the percent yield, divide the actual yield by the theoretical yield and multiply by 100:
Percent Yield = (Actual Yield / Theoretical Yield) x 100
Percent Yield = (36.6 g / 56.9 g) x 100 = 64.25%
Which of the following would be an example of basic research?
A) Edison's research that led to inventing the light bulb.
B) Morrison and Franscioni's research done to create the Frisbee.
C) Newton's discoveries of the laws of motion.
D) Spencer's research that led to the invention of the microwave oven.
Answer:
C) Newton's discoveries of the laws of motion.
Explanation:
Basic research is based on understanding of the natural phenomena. Like understanding why the apple fell down from a tree instead of going up in the sky. This thought propelled Newton to discover the laws of gravitation. Applied research on the other hand is about the discovery of technology that can harness the natural resources. Such as the discovery of solar panels and wind mills etc.
Which of these properties is the best one to use for identification of an element?
the number of neutrons in the atomic nucleus
the number of protons in the atomic nucleus
the number of isotopes that are formed by the element
the number of charges on ions of the element
Answer:
B
Explanation:
Number of protons in the atomic nucleus
The number of protons in the atomic nucleus is the best one to use for identification of an element. Therefore, the correct option is option B.
An element is a chemical compound which can be changed into another chemical component. The amount of protons in the atoms' nucleus, the basic building block of a chemical element, allows us to distinguish between different chemical elements.
Most of the baryonic material in the universe is composed of chemical components. When different elements undergo chemical reactions, particles get rearranged into new compounds that are held together by chemical bonds. The number of protons in the atomic nucleus is the best one to use for identification of an element.
Therefore, the correct option is option B.
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Is isopropyl alcohol a heterogeneous or homogeneous mixture
Explanation:
A mixture in which all the solute particles distribute uniformly into the solvent is known as a homogeneous mixture.
A homogeneous mixture is a clear solution with no solute particles seen in it.
For example, isopropyl alcohol is a clear solution. Hence, it is a homogeneous mixture.
On the other hand, a heterogeneous mixture is defined as the mixture in which solute particles are not uniformly distributed into the solvent.
For example, sand dissolved in water is a heterogeneous mixture.
Thus, we can conclude that isopropyl alcohol is a homogeneous mixture.
Isopropyl alcohol, also known as rubbing alcohol, is considered a homogeneous mixture.
What is a homogeneous mixtureA homogeneous mixture is a uniform mixture with the same composition and properties throughout. In the case of isopropyl alcohol, it consists of molecules of isopropyl alcohol uniformly distributed in the solvent (usually water).
It does not separate into distinct phases and exhibits the same characteristics and properties regardless of the location within the mixture.
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Here is the combustion reaction for octane (c8h18), which is a primary component of gasoline. how many moles of co2 are emitted into the atmosphere when 20.6 g of c8h18 is burned?
Answer:
0.5421 moles of carbon dioxide are emitted into the atmosphere.
Explanation:
[tex]1C_3H_8 + 5O_2 \rightarrow 3CO2 + 4H2O[/tex]
Moles of octane = [tex]\frac{20.6 g}{114 g/mol}=0.1807 mol[/tex]
According to reaction 1 mol of octane gives 3 moles of carbon dioxide.
Then, 0.1807 moles of octane will give:
[tex]\frac{3}{1}\times 0.1807 mol=0.5421 mol[/tex] of carbon dioxide
0.5421 moles of carbon dioxide are emitted into the atmosphere.
Part A
A sample of a compound is decomposed in the laboratory and produces 330 g carbon, 69.5 g hydrogen, and 440.4 g oxygen. Calculate the empirical formula of the compound.
Express your answer as an empirical formula.
The empirical formula of the compound is CH5O after dividing the molar amounts of carbon, hydrogen, and oxygen by the smallest molar amount and adjusting to get whole numbers.
Explanation:To calculate the empirical formula of the compound, we first need to find the molar amounts of each element based on their given masses. For carbon (C), we divide 330 g by its molar mass of 12.01 g/mol, which gives us 27.48 mol. For hydrogen (H), 69.5 g divided by 1.008 g/mol gives us 68.95 mol. For oxygen (O), 440.4 g divided by 16.00 g/mol gives us 27.53 mol. Next, we divide each molar amount by the smallest molar amount to get the simplest whole number ratio.
The smallest molar amount is 27.48 mol (for carbon), so we divide each element's molar amount by 27.48 mol. The resulting ratios are 1 for carbon, approximately 2.51 for hydrogen, and 1 for oxygen. The closest whole number ratio would then be interpreted as a 1:2.51:1 ratio, which we can approximate as 1:2.5:1. To convert it into whole numbers, we can multiply all the numbers by 2 to get the empirical formula C1H5O1, or simply CH5O.
Final answer:
By calculating the number of moles of carbon, hydrogen, and oxygen from the given masses and finding their simplest whole number ratio, the empirical formula of the compound is determined to be C₂H₅O₂.
Explanation:
Calculating the Empirical Formula:
To find the empirical formula of the compound, we need to convert the given masses of carbon (C), hydrogen (H), and oxygen (O) to moles. This is done by dividing the mass of each element by its respective atomic weight. The atomic weights of C, H, and O are 12.01 g/mol, 1.008 g/mol, and 16.00 g/mol, respectively. Hence, the number of moles of each element can be calculated as follows:
Carbon: 330 g ÷ 12.01 g/mol = 27.48 molesHydrogen: 69.5 g ÷ 1.008 g/mol = 68.95 molesOxygen: 440.4 g ÷ 16.00 g/mol = 27.53 molesNext, we determine the simplest whole number ratio of the moles of each element by dividing each value by the smallest number of moles calculated:
Carbon ratio: 27.48 ÷ 27.48 = 1Hydrogen ratio: 68.95 ÷ 27.48 ≈ 2.51Oxygen ratio: 27.53 ÷ 27.48 ≈ 1To convert these ratios to whole numbers, we can multiply each ratio by a common factor that converts the smallest decimal (in this case, the ratio of hydrogen) into a whole number, which is approximately 2 in this case. This gives us whole number ratios of:
Carbon: 1 × 2 = 2Hydrogen: 2.51 × 2 ≈ 5Oxygen: 1 × 2 = 2Therefore, the empirical formula of the compound is C₂H₅O₂ .
Which of the following is not a physical property of a liquid? indefinite volume indefinite shape definite mass
Answer: Option (a) is the correct answer.
Explanation:
When there occurs no change in chemical composition of a substance then it is known as a physical property.
For example, volume, mass, shape, size, density etc are all physical properties.
In liquids, the molecules are held by slightly less strong intermolecular forces of attraction as compared to a solid. So, the molecules of a liquid are able to slide over each other as they have kinetic energy.
Therefore, a liquid has indefinite shape because they acquire the shape of container in which they are placed. But a liquid does not have a definite volume.
Thus, we can conclude that indefinite volume is not a physical property of a liquid.
a 6.7 volume of air, initially at 23 degrees celsius and .98 atm, is compressed to 2.7 L while heated to 125 degrees celsius. What is the final pressure?
what are the characteristics of atmosphere 111
Suppose that magnesium would react exactly the same as copper in this experiment. how many grams of magnesium would have been used in the reaction if 1.000 g of silver were produced? the atomic mass of magnesium is 24.31 g/mol, and the atomic mass of silver is 107.87 g/mol
The solution for this problem would be:
We are looking for the grams of magnesium that would have been used in the reaction if one gram of silver were created. The computation would be:
1 g Ag (1 mol Mg) (24.31 g/mol) / (2mol Ag)(107.87g/mol) = 0.1127 grams of Magnesium
Final answer:
To calculate the grams of magnesium needed to produce 1.000 g of silver, we use the stoichiometry of the reaction and the molar masses of magnesium and silver. The result is 0.1128 grams of magnesium.
Explanation:
To determine how many grams of magnesium would have been used in the reaction if 1.000 g of silver were produced, we first need to understand the stoichiometry of the reaction. Assuming magnesium reacts in the same way as copper, let's consider a simple replacement reaction where magnesium would replace silver in a compound:
Mg + 2 AgNO3 → Mg(NO3)2 + 2 Ag
The atomic ratio and stoichiometry suggest that for every mole of magnesium, two moles of silver are produced. Since the atomic mass of silver (Ag) is 107.87 g/mol, the molar mass of magnesium (Mg) is 24.31 g/mol, and we have produced 1.000 g of Ag, we can perform the following calculations:
Calculate moles of Ag produced: (1.000 g Ag) / (107.87 g/mol) = 0.00928 moles of Ag.
Given the stoichiometry of the reaction, 1 mole of Mg produces 2 moles of Ag. Therefore, for 0.00928 moles of Ag, half the amount of Mg would react, which is 0.00928 / 2 = 0.00464 moles of Mg.
To find the grams of Mg: (0.00464 moles Mg) × (24.31 g/mol) = 0.1128 grams of Mg.
So, 0.1128 grams of magnesium would have been used to produce 1.000 g of silver.
2. You are given a clear solution of KNO3. Using 3 – 4 sentences (in your own words) explain how you would determine if the solution is unsaturated, saturated or supersaturated.
How do you calculate the number of photons having a wavelength of 10.0 micrometers required to produce 1.0 kilojoules of energy
To calculate this,
We know that energy is 1 photon
E = hc/wavelenth
wavelength of 10.0 m
Solution:
h = 6.626 x 10^-34 Jsec
C = 2.9979 x 10^8 m/sec
E = 6.626 10^-34 * 2.9979 10^8 / 10 = 1.9864 10^-26J
Then, the number of photons is computed by:
n = 1000 / 1.9864 10^-26 = 5.04 10^28 photons
If a new halogen were discovered with the name sapline and the symbol Sa, how would the following acids of sapline be named?
HSa
HSaO
HSaO2
HSaO3
HSaO4
Choose all the answers that apply. The chemical name for bleach is sodium hypochlorite (NaClO). It is created by a chemical reaction between sodium (Na), chlorine (Cl), and oxygen (O). Which substances are the reactants? Na Cl O NaClO
The chemical reaction for this is in the form of:
Na + Cl + O --> NaClO
The elements on the left side of the --> symbol are the reactants while on the right side we can find the product. Therefore the reactants are:
Na, Cl, and O
The chemical reaction for this is in the form of:
Na + Cl + O = NaClO
One cup of fresh orange juice contains 139 mg of ascorbic acid (vitamin c, c6h8o6) given that one cup = 264.8 ml calculate the molarity of vitamin c in organic juice.
What additional volume of 10.0 m hcl would be needed to exhaust the remaining capacity of the buffer after the reaction described in part b? express your answer in milliliters using two significant figures?
We start with an initial pH and transform this into moles. We then add a specified amount of HCL and calculate the new amount of moles. Then we calculate the remaining concentration of the acid by taking the difference of the initial and the added amounts. We convert volumes for values into required units for the proper calculation of the final concentration of HCl.
Explanation:To find the additional volume of 10.0M HCl needed to exhaust the remaining capacity of the buffer after the reaction described in part b, we must calculate the moles of H3O+. We start with an initial pH of 1.8 x 10^-5 M HCl, which when converted to moles/L gives us 1.8 x 10^-6 moles. With the addition of 1.0 mL of 0.10 M HCl, we add 1.0 x 10^-4 moles of H3O+. Then the titrant volume is computed, which is 12.50 mL. Remember, since the acid sample and the base titrant are monoprotic and equally concentrated, this titrant addition involves less than a stoichiometric amount of base, hence, it completely reacts with the remaining acid in the solution. For the proper calculation, we convert the 0.500-L volume into milliliters, and we also express the mass percentages as ratios. The final concentration of HCl is computed using the provided volume of HCl solution and the definition of molarity.
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The combustion of 0.374 kg of methane in the presence of excess oxygen produces 0.983 kg of carbon dioxide. What is the percent yield?
Explain the difference between an ignition transformer and a solid-state igniter
Ignition transformer
1. Weight of the transformer is more.
2. Voltage output of the transformer is from 10,000 volts to 14,000 volts.
3. Due to lower voltage output, fuel vaporization and ignition will be slow.
4. When there is a drop in voltage supply, the transformer gets affected.
5. Consumption of electricity is more.
Solid state igniter.
1. Igniter weighs very light
2. Igniter giver voltage output in the range of 14,000 volts to 20,000 volts
3. Higher voltage output leads to faster vaporization of fuel and ignition
4. Very small affect is observed when there is a voltage drop.
5. Less electricity is consumed.
An ignition transformer is a conventional technology used to produce high voltage for ignition in gas and oil burners. In contrast, a solid-state igniter is a more advanced technology that uses semiconductors to convert ionizing radiation into an electrical signal for ignition. The latter is considered faster and more reliable.
Explanation:An ignition transformer and a solid-state igniter are two different types of devices that play a key role in igniting a system. To understand their differences, we need to look at their functionality in detail.
An ignition transformer is conventional technology used to generate a high voltage needed for ignition in gas and oil burners. It mainly functions by stepping up the voltage, with the output being a high-AC voltage which forms a spark for the ignition of the flame.
On the other hand, a solid-state igniter is a newer technology that uses electronics, specifically semiconductors, to produce the high voltage required for ignition. Since the semiconductors can be constructed in a way that they do not conduct current in a particular direction, ionizing radiation produced by the system can be directly converted into an electrical signal, thereby leading to ignition. With solid-state igniters, the response time is often faster, and the performance is considered more reliable because of fewer moving parts, thus leading to reduced maintenance.
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How many grams of copper would you need to add if you wanted to produce 8.000 grams of silver? The atomic mass of copper is 63.55 g/mol, and the atomic mass of silver is 107.87 g/mol.
To produce 8g of silver, you'd need approximately 4.7g of copper, assuming a 1:1 molar ratio in their reaction.
Explanation:Before calculating the grams of copper needed to produce 8 grams of silver, you first need to express the mass of silver in moles. To do this, divide the mass by the atomic mass of silver. Next, find the molecular ratio in the reaction of copper to silver. In this case, we'll treat it as a 1:1 ratio as the question didn't provide one. Hence, the moles of copper required will be the same we calculated for silver. Lastly, convert these moles of copper back into grams using the atomic mass of copper.
Let's put this into practice:
The molar mass of silver (Ag) is 107.87 g/mol. Therefore, 8g of silver corresponds to 8 / 107.87 = 0.074 mol.Each mole of copper produces one mole of silver (assuming a 1:1 molar ratio), so you'll need 0.074 mol of copper.The atomic mass of copper is 63.55 g/mol, so 0.074 mol corresponds to 0.074 mol * 63.55 g/mol = 4.7 g approximately.So, you will need approximately 4.7 g of copper to produce 8 g of silver, given a 1:1 molar ratio in their reaction.
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An unstable nucleus which starts a decay process is called the parent nuclide. True
False
Answer: The correct answer is True.
Explanation:
Radioactive decay is defined as the process in which an unstable nuclei breaks down into stable nuclei via various methods.
The unstable nucleus is known as parent nuclide and stable nucleus is known as daughter nuclide.
There are many decay processes by which a parent nucleus can undergo decay. They are:
Alpha decay: In this process, alpha particle is released.Beta decay: In this process, beta particle is released.Gamma decay: In this process, gamma particle is released.Thus, the correct answer is True.
Isoflurane, shown here, is a common inhalation anesthetic. write its molecular formula and calculate its percent composition by mass
Molecular formula of Isoflurane is C₃H₂ClF₅O.
Now calculate the percent composition by mass, which means percent of each element in the compound.
Mass of Isoflurane = 184.49 g/mol
Mass of carbon in the compound = 3 x 12.011 = 36.033g
Mass of hydrogen in the compound = 2 x 1.008 = 2.016g
Mass of chlorine in the compound = 1 x 35.453 = 35.453 g
Mass of fluorine in the compound = 5 x 18.998 = 94.99g
Mass of Oxygen in the compound = 1 x 16 = 16 g
Carbon’s percentage = Mass of carbon in the compound /mass of isoflurane x 100 =36.033/184.49 x 100 =19.53%
Hydrogen’s Percentage = Mass of hydrogen in the compound/mass of isoflurane x 100 = 2.016/184.49 = 1.09%
Chlorine’s percentage = Mass of chlorine in the compound/mass of isoflurane x 100 = 35.453/184.49 =19.22%
Flourine’s percentage = Mass of fluorine in the compound/mass of isoflurane x 100 = 94.99/184.49 x 100 = 51.49%
Oxygen’s percentage = Mass of Oxygen in the compound/mass of isoflurane x 100 =16/184.49 x 100 = 8.67%
The molecular formula of isoflurane is C3H2ClF5O. The percent composition by mass is approximately: C: 19.54%, H: 1.04%, Cl: 19.25%, F: 51.93%, O: 8.23%.
Explanation:The molecular formula for isoflurane is C3H2ClF5O. To calculate its percent composition by mass, we need to determine the molar mass of isoflurane and then find the contribution of each element to the total mass.
The molar mass of isoflurane can be calculated by summing the atomic masses of each element in the formula:
Molar Mass = (3 x Atomic Mass of C) + (2 x Atomic Mass of H) + Atomic Mass of Cl + (5 x Atomic Mass of F) + Atomic Mass of O
Using the atomic masses from the periodic table, we can calculate:
Molar Mass = (3 x 12.01) + (2 x 1.01) + 35.45 + (5 x 18.99) + 16.00
Molar Mass = 184.06 g/mol
Calculating Percent Composition
The percent composition by mass of an element in a compound is given by:
Percent Composition = (Mass of Element / Total Mass of Compound) x 100
We can calculate the percent composition for each element in isoflurane by dividing the mass contribution of the element by the total molar mass:
% C = (3 x Atomic Mass of C) / Molar Mass x 100
% H = (2 x Atomic Mass of H) / Molar Mass x 100
% Cl = Atomic Mass of Cl / Molar Mass x 100
% F = (5 x Atomic Mass of F) / Molar Mass x 100
% O = Atomic Mass of O / Molar Mass x 100
Substituting the atomic masses and molar mass values, we can calculate the percent composition:
% C = (3 x 12.01) / 184.06 x 100 = 19.54%
% H = (2 x 1.01) / 184.06 x 100 = 1.04%
% Cl = 35.45 / 184.06 x 100 = 19.25%
% F = (5 x 18.99) / 184.06 x 100 = 51.93%
% O = 16.00 / 184.06 x 100 = 8.23%
So, the percent composition by mass of isoflurane is approximately:
If 24.5 ml of base are required to reach the color endpoint of an acid/base titration what volume of base is actually needed
Answer:
Equal to
Explanation:
The other person who answered gave a great long explanation, so short answer: Equal to
The laws of electrostatics predict that protons will
According to the equation for this chemical reaction, what does the 2 in front of 2Ag tell us?
Answer:
It tell us that it's necessary 2 moles of Ag in the stoichiometric proportion of the reaction.
Explanation:
The equation of a chemical reaction is a representation of the ideal reaction: 100% yield of the products and without parallel reactions. So, the equation presents the stoichiometric quantities of the substance. For example, for a generic reaction:
A + 2B → 3C
It says that it's necessary 1 mol of A and 2 moles o B to form 3 moles of C. Thus, the numbers before the substances represents the stoichiometric number of moles of that substance.
Match the element with its description. Match Term Definition Potassium A) Great conductor of heat and electricity Barium B) Malleable and highly reactive Boron C) Has properties of both metals and nonmetals Neon D) Nonreactive gas
Great conductor of heat and electricity: Barium
Malleable and highly reactive: Potassium
Has properties of both metals and nonmetals: Boron
Nonreactive gas: Neon
The group of elements that has the ability to conduct electricity and heat is Group I or II. Barium belongs to Group II and has been able to conduct electricity and heat.The group I elements are malleable and highly reactive. Potassium belongs to group I metal and is highly malleable and reactive.The noble gases have the properties of both metal and non-metal. The Boron has properties of both.The noble gases are non-reactive gases. Thus neon has been the non-reactive gas.For more information about the elements of the periodic table, refer to the link:
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Potassium is a metal that is a great conductor of heat and electricity. Barium is a highly reactive metal. Boron is a metalloid with properties of both metals and nonmetals. Neon is a nonreactive gas.
Explanation:Potassium is a great conductor of heat and electricity, making it a metal. Barium is an element that is shiny, malleable, and highly reactive, also a metal. Boron is a metalloid, which means it has properties of both metals and nonmetals. Neon is a nonreactive gas.
Potassium is best matched with 'Malleable and highly reactive', Barium with 'Great conductor of heat and electricity', Boron with 'Has properties of both metals and nonmetals', and Neon with 'Nonreactive gas'.
Write a loop that subtracts 1 from each element in lowerscores. if the element was already 0 or negative, assign 0 to the element.
To subtract 1 from each element in the lowerscores array, you can use a for loop. Within the loop, you can check if the current element is already 0 or negative. If it is, assign 0 to the element. Otherwise, subtract 1 from the element.
Explanation:To subtract 1 from each element in the lowerscores array, you can use a for loop. Within the loop, you can check if the current element is already 0 or negative. If it is, assign 0 to the element. Otherwise, subtract 1 from the element.
for (int i = 0; i < lowerscores.length; i++) {In this example, 'lowerscores' represents the array that contains the scores. The loop iterates through each element of the array and performs the desired subtraction or assignment based on the given condition.
Which statement about van der Waals forces is true?
When the forces are weaker, a substance will have higher volatility.
When the forces are stronger, a substance will have lower viscosity.
When the forces are weaker, the boiling point of a substance will be higher.
When the forces are stronger, the melting point of a substance will be lower
Answer:
When the forces are weaker, a substance will have higher volatility
Explanation:
Vander Waal's forces are the weakest among the intermolecular forces of attraction. This arises due to the creation of instantaneous dipole moments caused by an instantaneous shift of electrons is a molecule. Stronger the force, stronger will be the interaction between molecules which will in turn be held strongly. When the forces the weaker, the bonds between molecules can be broken easily as a result of which the substance will have a higher volatility.
Answer:
When the forces are weaker, a substance will have higher volatility
Explanation:
A chemical reaction requires 31.39 kj. how many kilocalories does this correspond to?
The chemical reaction that requires 31.39 kilojoules equate to approximately 7.5 kilocalories, as 1 kilocalorie equals approximately 4.184 kilojoules.
Explanation:To convert kilojoules to kilocalories, you need to use the conversion factor of 1 kilocalorie equals approximately 4.184 kilojoules. Therefore, to find the equivalent in kilocalories for 31.39 kilojoules, you divide 31.39 by 4.184.
So, the calculation will be 31.39 kJ / 4.184 kcal/kJ = ~7.5 kcal. Hence, the chemical reaction that requires 31.39 kj is equivalent to about 7.5 kilocalories.
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Calculate the mass in grams of 1.32x10^20 uranium atoms
To calculate the mass of 1.32x10^20 uranium atoms, we divide the number of atoms by Avogadro's number to convert atoms to moles. Then, we multiply by the molar mass of uranium to convert moles to grams, which gives us 0.0515 grams.
Explanation:To calculate the mass of a given number of uranium atoms we first need to know that Avogadro's number (6.02 × 10^23) tells us how many atoms are in one mole of any substance. In this case the molar mass of uranium (U) is 235.04 g/mol.
First, we'll find how many moles 1.32x10^20 atoms represent by dividing by Avogadro's number: (1.32x10^20 atoms) / (6.02x10^23 atoms/mole) which gives us approximately 2.19x10^-4 moles.
Then we multiply this by the molar mass of uranium to get the mass in grams: (2.19x10^-4 mol) * (235.04 g/mol) = 0.0515 grams of uranium.
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The mass of 1.32 x 10²⁰ uranium atoms is approximately 0.0521 grams.
To calculate the mass in grams of 1.32 x 10²⁰ uranium atoms, we need to follow these steps:
1. Determine the molar mass of uranium.
2. Calculate the number of moles of uranium atoms.
3. Convert the moles of uranium atoms to grams.
The molar mass of uranium (U) is approximately 238.03 g/mol.
First, recall Avogadro's number, which is 6.022 x 10²³ atoms/mol. This represents the number of atoms in one mole of any substance.
Number of moles = [tex]\frac{\text{Number of atoms}}{\text{Avogadro's number}}[/tex]
Number of moles = [tex]\frac{1.32 \times 10^{20} \, \text{atoms}}{6.022 \times 10^{23} \, \text{atoms/mol}}[/tex]
Number of moles = [tex]\frac{1.32 \times 10^{20}}{6.022 \times 10^{23}}[/tex]
Let's calculate this:
Number of moles = 2.19 x 10⁻⁴ moles
Now, convert the number of moles to grams using the molar mass of uranium:
Mass (grams) = Number of moles x Molar mass
Mass (grams) = 2.19 x 10⁻⁴ moles x 238.03 g/mol
Mass (grams) = 2.19 x 10⁻⁴ x 238.03
Mass (grams) = 0.0521 grams