Percent Composition & Empirical Formula Review Quizizz

What is Carbon's percentage by mass in CO?

• 29%

• 43%

• 57%

• 73%

What is oxygen's percentage by mass in CO?

• 29%

• 43%

• 57%

• 73%

What percentage by mass is phosphorous in Li₃P?

• 13%

• 29%

• 40%

• 60%

What percentage by mass is lithium in Li₃P? (Hint: consider all three atoms of lithium in your calculation)

• 13%

• 29%

• 40%

• 60%

What is the percent by mass of fluorine in CaF₂ (CaF₂ = 78 g/mol)?

• 24%

• 49%

• 51%

• 65%

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

• 20%

• 27%

• 46%

• 53%

What is the percent composition of Benzene, C₆H₆?

• C = 50%
  H = 50%
• C = 85.7 %
  H = 14.3%
• C = 92.2%
  H = 7.8%
• C = 71.9%
  H = 28.1%

Which element in the compound potassium cyanide, KCN, has a percent composition of 60%?

• K

• C

• N

• None of the above

A formula with the lowest whole # ratio of elements in a compound is called

• Molecular Formula
• Chemical Formula
• Empirical Formula 
• Distance Formula

What is the empirical formula for C₄H₆?

• CH

• CH₃

• C₂H₃

• C₄H₆