Changing Mass To Moles And Moles To Mass

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

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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Theoretical Chemistry Quizzes & Trivia

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

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

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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3. How many grams of Calcium are present in 2.3 moles?

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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4. How many grams of NaCl is present in 6.3 moles?

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

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 CO2 are there in 171.639 g of CO­2?

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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7. How many moles are there in 814.504 g of H2O?

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 K­2O are in 367.38 g of K2O?

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

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

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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How many grams of NH­3  are in 9.2 moles? (The molar mass of...
How many grams are in 2.3 moles of Na2SO4? (The molar mass of Na2SO4...
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 of LiCl are in 6.7 moles? (The molar mass of LiCl =...
How many moles of CO2 are there in 171.639 g of CO­2?
How many moles are there in 814.504 g of H2O?
How many moles of K­2O are in 367.38 g of K2O?
How many moles of LiBr are there in 486.30 g of LiBr? (The molar mass...
How many moles of AlCl3 are there in 1,119.972 g?
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