Percent Composition

What is the percent composition of sodium in table salt (NaCl)?

• 39.3%

• 50.0%

• 60.7%

• 70.0%

What is the percent composition of chlorine in table salt (NaCl)?

• 39.3%

• 50.0%

• 60.7%

• 70.0%

What is the percent composition of iron in iron(III) oxide, Fe₂O₃?

• 69.9%

• 77.7%

• 30.1%

• 22.3%

What is the percent composition of oxygen in iron(II) oxide, FeO?

• 69.9%

• 77.7%

• 30.1%

• 22.3%

Which compound has a higher percentage of iron, Fe₂O₃ or FeO?

• Fe₂O₃

• FeO

• Both have the same percentage

• Cannot be determined

What is the formula to calculate the part in percentage problems?

• part = whole x %(decimal)

• part = whole / %(decimal)

• part = %(decimal) / whole

• part = whole + %(decimal)

How do you convert 1.75% into decimal form?

• 0.175

• 0.0175

• 1.75

• 0.00175

What operation is used to find the percentage when you have the part and the whole?

• Addition

• Subtraction

• Multiplication

• Division

What is the formula for calculating percent composition?

• % composition = (total mass / mass of element) × 100

• % composition = (mass of element / total mass) × 100

• % composition = (mass of element × total mass) / 100

• % composition = (mass of element + total mass) × 100

What is the purpose of calculating percent composition in a compound?

• To determine the total mass of the compound

• To find the percentage of each element in the compound

• To calculate the density of the compound

• To measure the volume of the compound