3-4:  Mass percents of atoms

  1. Calculate the percent composition of calcium in calcium chloride.

 

 

  1. What is the percent composition of sodium in sodium chloride?

 

 

  1. Given the organic molecule, C6H12O6, calculate the percent oxygen in the molecule.

 

 

  1. What is the percent of carbon in methane, CH4?

 

 

  1. Calculate the percent sulfur in Cu2S.