Molar Mass & Percent Composition

What are the units for molar mass?

• grams
• amu
• grams/mole
• liters

Tags

NGSS.HS-PS1-7

What is the molar mass of B₂(CO₃)₃?

• 81.632 g/mol
• 94.842 g/mol
• 38.822 g/mol
• 201.648 g/mol

Fluorine is diatomic.  What is the molar mass of fluorine gas?

• 18.998 g/mol
• 37.996 g/mol
• 9 g/mol
• 18 g/mol

What is the percent by mass of magnesium in MgO?

• 20%
• 40%
• 50%
• 60%

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 percent of Zn₃(PO₄)₂ is zinc?

• 33.15%
• 16.04%
• 50.81%
• 19.68%

What is the molar mass of Zn(C₂H₃O₂)₂

• 392.8g/mol
• 142.9g/mol
• 361g/mol
• 183.5 g/mol

What percent of magnesium bromide, MgBr₂, is magnesium?

• 13.19%
• 86.8%
• 7.58%
• 13.20%

Number of H in 3(NH₄)₂CrO₄

• 4
• 2
• 8
• 24