Percent by Mass

Choose the formula for calculating percentage composition

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Cane sugar is a white, odorless, crystalline powder with a sweet taste and the formula C₁₂H₂₂O₁₁. what is the percentage composition of hydrogen in cane sugar?

• 6.43%

• 51.5%

• 72.4%

• 4.23%

What is the percent of phosphorus by mass in phosphoric acid, H₃PO₄? (Your answer should be rounded to three significant figures. Don't include units. E.g. 12.3)

Tags

NGSS.HS-PS1-7

What is the percent by mass of calcium in calcium carbonate, CaCO₃? (Your answer should be rounded to three significant figures. Don't include units. E.g. 12.3)

Tags

NGSS.HS-PS1-7

What is the percent by mass of oxygen in magnesium oxide, MgO? (Your answer should be rounded to three significant figures. Don't include units. E.g. 12.3)

Tags

NGSS.HS-PS1-7

What is the percent by mass of hydrogen in HNO₃?

• 22.2

• 1.59

• 25.4

• 76.2

What is the percent composition by mass of sulfur in Na₂SO₄?

• 22.5%

• 32.4%

• 50%

• 18.5%

What is the molar mass of HCl?

• 35.5g/mole

• 36.5g/mole

• 37.5g/mole

• 38.5g/mole

What is the molar mass of H₂O?

• 16g/mole

• 18g/mole

• 20g/mole

• 22g/mole

What is the molar mass of table salt, NaCl?

• 36,5g/mole

• 22,5g/mole

• 23g/mole

• 58,5g/mole