Calculate the mass percent composition for each of the following compounds: separate answer by commas

Question

a) 3.85  of  Ca and 3.90  of F

b) 0.340 g of Na and 0.215g of O

c) 12.4 of K, 17.5 g of Mn and 20.3 g of O 

Answer 1

Hello, Ailyn,

Tabulate each mass by element, add them, and then use the total to find the percentage of each element:

e.g., % mass of K is 12.4g/57.95g

Bob