Changing Mass To Moles And Moles To Mass

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| By Kwchiro

Kwchiro

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Quizzes Created: 40 | Total Attempts: 359,306

Questions: 10 | Attempts: 996 | Updated: Mar 21, 2023

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

Questions and Answers

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
Correct Answer
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
Correct Answer
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
Correct Answer
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
Correct Answer
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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0
1
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
Correct Answer
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
Correct Answer
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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1
1
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
Correct Answer
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
Correct Answer
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
Correct Answer
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
Correct Answer
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
ProProfs Editorial Team
Jul 30, 2010

Quiz Created by
Kwchiro

Changing Mass To Moles And Moles To Mass

How many grams of Calcium are present in 2.3 moles?

How many grams of NaCl is present in 6.3 moles?

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

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

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

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

How many moles are there in 814.504 g of H2O?

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

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

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

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

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

How many moles are there in 814.504 g of H₂O?

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

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

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