Percent Composition quiz

What is the percentage of oxygen in carbon dioxide? (CO₂)

• 27.3%

• 72.7%

• 70%

• 80%

What is the percentage of chlorine in sodium chloride? (NaCl)

• 60.7%

• 39.3%

• 60%

• 44 %

What is the percentage of carbon in sucrose?(C₁₂H₂₂O₁₁)

• 51.5%

• 6.4%

• 42.1%

• 62%

Tags

NGSS.HS-LS1-6

What is the percentage of iron in iron(III)oxide?

• 30%

• 70%

• 60%

• 55%

Caffeine's molecular formula is C₈H₁₀N₄O₂. The molar mass of caffeine is 194g/mol. What is the percentage of carbon in caffeine?

• 8.2%

• 16.5%

• 49.5%

• 22.5%

Calculate the percent by mass of Nitrogen in NH₂CONH₂

• 6.65% N

• 56.65% N

• 46.65% N

• 39.9% N

Calculate the percent by mass of Oxygen in Potassium Chlorate (KClO₃).

• 39.17% O

• 71.17% O

• 60.83% O

• 56.73 % O

Calculate the percent mass of Bromine in Calcium Bromide (CaBr₂)

• 21.05% Br

• 79.95% Br

• 20.5% Br

• 69.34 % Br

Tags

NGSS.HS-PS1-7

Calculate the percent composition of Magnesium Carbonate MgCO₃

• 28.8% O 14.2% C 56.9% Mg

• 28.8% C 14.2% Mg 56.9% O

• 28.8% Mg 14.2% C 56.9% O

What is the percent composition of each element in Potassium Cyanide KCN?

• 60.0% K 18.4% C 21.5% N

• 60.0% C 18.4% K 21.5% N

• 60.0% K 18.4% N 21.5% C