Percent Composition and Molar Mass

This video tutorial explains how to calculate the percent composition of each element in zinc sulfate (ZnSO4). It begins with an introduction to the concept of percent composition, followed by detailed steps to calculate the percent composition of zinc, sulfur, and oxygen in ZnSO4. The tutorial provides the molar masses of each element and demonstrates the calculations needed to find their respective percentages in the compound.

What is the first step in finding the percent composition of an element in a compound?

• Subtract the element's mass from the compound's mass.

• Calculate the compound's total mass.

• Identify the element's molar mass.

• Multiply by 100.

What is the molar mass of zinc used in the calculation?

• 32.07 g/mol

• 16.00 g/mol

• 65.38 g/mol

• 161.45 g/mol

How is the percent composition of zinc in zinc sulfate calculated?

• Subtract zinc's molar mass from the total molar mass.

• Divide zinc's molar mass by the total molar mass and multiply by 100.

• Add zinc's molar mass to the total molar mass.

• Multiply zinc's molar mass by the total molar mass.

What is the percent composition of zinc in zinc sulfate?

• 19.86%

• 16.00%

• 39.64%

• 40.05%

What is the percent composition of sulfur in zinc sulfate?

• 19.86%

• 40.05%

• 39.64%

• 16.00%

How many oxygen atoms are considered in the calculation for zinc sulfate?

• One

• Two

• Four

• Three

What is the molar mass of oxygen used in the calculation?

• 65.38 g/mol

• 161.45 g/mol

• 16.00 g/mol

• 32.07 g/mol

What is the percent composition of oxygen in zinc sulfate?

• 39.64%

• 16.00%

• 40.05%

• 19.86%