# Changing Mass To Moles And Moles To Mass

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Quizzes Created: 40 | Total Attempts: 363,668
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How many grams of Calcium are present in 2.3 moles of calcium?

• 1.

### How many grams of Calcium are present in 2.3 moles?

• A.

92.18 g

• B.

24.02 g

• C.

40.08 g

• D.

80.16 g

A. 92.18 g
Explanation
Grams will be a larger number than moles.
So, to calculate moles and MULTIPLY it by molar mass.
(Hint: Think multiplication to get a larger number).
1St: Find the molar mass of Calcium (look on the periodic table): 40.08 g
2nd: Multiply the number of moles by the molar mass: 40.08 x 2.3

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• 2.

### How many grams of NaCl is present in 6.3 moles?

• A.

58.44 g

• B.

368.17 g

• C.

231.2 g

• D.

9.27 g

B. 368.17 g
Explanation
Grams will be a larger number than moles.
So, to calculate moles and MULTIPLY it by molar mass.
(Hint: Think multiplication to get a larger number).
1St: Find the molar mass of NaCl: Na 22.99 + 35.45 = 58.44 g
2nd: Multiply the number of moles by the molar mass: 6.3 x 58.44 g/mol = 368.17

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• 3.

### How many grams are in 2.3 moles of Na2SO4? (The molar mass of Na2SO4 is 142.05g/mol)

• A.

61.76 g

• B.

326.72 g

• C.

163.36 g

• D.

81.68 g

B. 326.72 g
Explanation
Grams will be a larger number than moles.
So, to calculate moles and MULTIPLY it by molar mass.
Multiply the number of moles by the molar mass: 2.3 x 142.05 g/mol = 326.72 g

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• 4.

### How many grams of NH­3  are in 9.2 moles? (The molar mass of NH3= 17.03 g/mol)

• A.

1.85 g

• B.

19.25 g

• C.

156.68 g

• D.

123.83 g

C. 156.68 g
Explanation
Grams will be a larger number than moles.
So, to calculate moles and MULTIPLY it by molar mass.
Multiply the number of moles by the molar mass: 9.2 x 17.03 = 156.68 g

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• 5.

### How many grams of LiCl are in 6.7 moles? (The molar mass of LiCl = 42.39 g/mol)

• A.

42.39 g

• B.

6.33 g

• C.

239.01 g

• D.

284.01 g

D. 284.01 g
Explanation
Grams will be a larger number than moles.
So, to calculate moles and MULTIPLY it by molar mass.
Multiply the number of moles by the molar mass: 6.7 x 42.39 g/mol = 284.01 g

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• 6.

### How many moles of LiBr are there in 486.30 g of LiBr? (The molar mass of LiBr = 86.84 g/mol)

• A.

5.6 moles

• B.

42,230.292 moles

• C.

193.2 moles

• D.

3.0 moles

A. 5.6 moles
Explanation
Moles will always be a SMALLER number than grams.
So, to calculate: Take the grams DIVIDE by molar mass.
(Hint: Think division generally gives us a smaller number, multiplication generally gives us a larger number).
485.30 grams divided by the molar mass (86.84) = 5.6 moles

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• 7.

### How many moles are there in 814.504 g of H2O?

• A.

14,677.36 moles

• B.

20.2 moles

• C.

45.2 moles

• D.

3,214.52 moles

C. 45.2 moles
Explanation
Moles will always be a SMALLER number than grams.
So, to calculate: Take the grams DIVIDE by molar mass.
(Hint: Think division generally gives us a smaller number, multiplication generally gives us a larger number).
Molar mass of water: Hydrogen 2(1.01) + Oxygen 1 (16.00) = 18.02 g/mol
Divide grams 814.504 g by molar mass (18.02) = 45.2 moles

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• 8.

### How many moles of CO2 are there in 171.639 g of CO­2?

• A.

44.01 moles

• B.

3.9 moles

• C.

7,5553.83 moles

• D.

130.22 moles

B. 3.9 moles
Explanation
Moles will always be a SMALLER number than grams.
So, to calculate: Take the grams DIVIDE by molar mass.
(Hint: Think division generally gives us a smaller number, multiplication generally gives us a larger number).
Molar mass of CO2 = Carbon (12.01) + Oxygen 2(16.00) = 44.01 g/mol
Divide grams 171.639 by molar mass (44.01) = 3.9 moles

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• 9.

### How many moles of K­2O are in 367.38 g of K2O?

• A.

34,607.2 moles

• B.

367.38 moles

• C.

3.9 moles

• D.

5.9 moles

C. 3.9 moles
Explanation
Moles will always be a SMALLER number than grams.
So, to calculate: Take the grams DIVIDE by molar mass.
(Hint: Think division generally gives us a smaller number, multiplication generally gives us a larger number).
Molar mass of K2O = Potassium 2 (39.1) + Oxygen (16.00) = 94.2 g/mol
Divide grams 367.38 by molar mass (94.2 g/mol) = 3.9 moles

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• 10.

### How many moles of AlCl3 are there in 1,119.972 g?

• A.

8.4 moles

• B.

16.8 moles

• C.

32,739.04 moles

• D.

6.2 moles

A. 8.4 moles
Explanation
Moles will always be a SMALLER number than grams.
So, to calculate: Take the grams DIVIDE by molar mass.
(Hint: Think division generally gives us a smaller number, multiplication generally gives us a larger number).
Molar mass of AlCl3= Aluminum (26.98) + Chlorine 3(35.45) = 133.33 g/mol
Divide the grams 1,119.972 by the molar mass 133.33g/mol = 8.4 moles

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• Current Version
• Mar 21, 2023
Quiz Edited by
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• Jul 30, 2010
Quiz Created by
Kwchiro

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