Percent Composition

(Page 38-40) Percent Composition is the ​ (a)   by ​ (b)   of each element in a compound.

• percentage

• mass

• compound

Percent Composition is the ​ _____ by ​ _____ of each element in a compound.

• percentage

• mass

• compound

• volume

Tags

NGSS.HS-PS1-7

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

• 33.33%

• 66.67%

• 88.89%

• 11.11%

Tags

NGSS.MS-PS1-1

If a compound is made of 40% carbon, 6.7% hydrogen, and 53.3% oxygen, what is the percent composition of carbon?

• 40%

• 6.7%

• 53.3%

• 100%

Which of the following formulas is used to calculate percent composition?

A sample of a compound contains 10g of hydrogen and 80g of oxygen. What is the percent composition of hydrogen?

• 11.11%

• 12.5%

• 10%

• 20%

Tags

NGSS.MS-PS1-1

In a laboratory experiment, a student finds that a sample contains 5g of nitrogen and 15g of oxygen. What is the percent composition of nitrogen?

• 25%

• 33.33%

• 50%

• 75%

Which of the following statements is true about percent composition?

• It is always expressed in grams.

• It is a measure of the concentration of a solution.

• It is the percentage by mass of each element in a compound.

• It is used to determine the volume of gases.

How does the percent composition help in determining the empirical formula of a compound?

• By providing the exact number of atoms of each element.

• By giving the ratio of masses of each element.

• By showing the molecular structure.

• By indicating the physical state of the compound.

What is the percent composition of carbon in carbon dioxide (CO2)?

• 27.29%

• 72.71%

• 44.01%

• 55.99%