Mass Percent

What is the percent composition by mass of sulfur in the compound MgSO₄ (gram formula mass = 120 g/mol)?

• 20%

• 27%

• 46%

• 53%

In which compound is the percent composition by mass of Cl equal to 42%?

• HClO (gram formula mass = 52 g/mol)

• HClO₂ (gram formula mass = 68 g/mol)

• HClO₃ (gram formula mass = 84 g/mol)

• HClO₄ (gram formula mass = 100 g/mol)

What is the percent by mass of N in (NH₄)₂S?

• 47.1%

• 68.1%

• 44.1%

• 41.1%

Gallium nitride (GaN) is an important material in computer chips. What is the percent composition of gallium in gallium nitride?

• 83%

• 17%

• 100%

• 0.8327

The mass % of H in methane (CH₄) is:

• 75%

• 92%

• 25%

• 4%

• 6%

Tags

NGSS.MS-PS1-1

Find the percentage composition of Mg in Mg₃(PO₄)₂.

• 27.48% Mg

• 43.11% Mg

• 16.00% Mg

• 12.63% Mg

What is the percentage of chromium in K₂Cr₂O₇?

• 38.1%

• 27.2%

• 34.7%

• 100%

What is the percent by mass of oxygen in MgO? Hint: The attached image is an example of a worked problem other than this one.

• 20%

• 40%

• 50%

• 60%

What is the mass percent of oxygen in water (H2O)?

• 88.8%

• 11.2%

• 33.3%

• 66.7%

In which compound is the mass percent of carbon equal to 27%?

• C2H5OH (gram formula mass = 46 g/mol)

• CH3COOH (gram formula mass = 60 g/mol)

• C6H12O6 (gram formula mass = 180 g/mol)

• C3H8 (gram formula mass = 44 g/mol)