Percentage 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)

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