Molar Mass and Percent Composition

What is the percent composition by mass of sulfur (S) in the compound MgSO₄?

• 20.22%

• 19.85%

• 26.64%

• 28.64%

What is the molar mass of PbSO₄

• 303.3 g/mol
• 294.7g/mol
• 163.8g/mol
• 372g/mol

What is the percent by mass of magnesium in MgO?

• 20%
• 40%
• 50%
• 60%

What is the percent by mass of sodium in NaCl?

• 39%
• 61%
• 35%
• 65%

Find the percent composition of Cu in CuBr₂ .   

• 28.45%
• 32.85%
• 17.78%
• 68.10%

What is the percent composition in NaOH of Na?

• 19.55%

• 57.7%

• 25%

• 76.45%

What is the molar mass of NaOH?

• 39.997 g/mol
• 38.989 g/mol
• 23.998 g/mol
• 57.004 g/mol

What is the molar mass of B₂(CO₃)₃?

• 81.632 g/mol

• 94.842 g/mol

• 38.822 g/mol

• 201.644 g/mol

What is the molar mass of AgF

• 514.9g/mol

• 99.7g/mol

• 126.866 g/mol

• 198.8g/mol

What is the molar mass of Ca(OH)₂

• 74.094 g/mol

• 210.0g/mol

• 98.9g/mol

• 219.9g/mol