Percent Composition

You are given the following percentages: 40.05% S and 59.95% O. Find the empirical formula for these elements so that you can give the correct name of the compound formed.

• Sulfur monoxide

• Sulfur dioxide

• Sulfur trioxide

• Sulfur tetroxide

Which of the following is NOT needed to calculate percent composition?

• Mass of specific element

• Molar Mass

• Avogadro's Number

• Division

What is the percent composition on Oxygen in NO₂? (rounded)

• 40%

• 50%

• 60%

• 70%

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

Find the percent composition of Cu in CuBr₂ .   

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

• 47.1%

• 68.1%

• 44.1%

• 41.1%

What is the empirical formula if you have 88.80% copper and 11.20% oxygen?

• Cu₃O₈

• CuO₄

• Cu₂O

• Cu₄O₁₀

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

• 20%

• 27%

• 46%

• 53%

What is the percent composition of hydrogen in water (H2O)?

• 11.1%

• 33.3%

• 66.7%

• 88.9%

Tags

NGSS.MS-PS1-1

Which of the following is necessary to calculate the percent composition of a compound?

• Atomic mass of each element

• Volume of the compound

• Temperature of the reaction

• Pressure of the system