Question

IF HAVE 210.3 GRAMS OF AN UNKNOWN COMPOUND THAT CONTAINS 12.3 GRAMS OF HYDROGEN,WHAT IS THE PERCENT BY MASS OF HYDROGEN IN THE COMPOUND?
A)12.3%
B)210.3%
C)5.85%
D)17.O9%

Answer 1

mass by mass % of hydrogen = 12.3*100/210.3
mass by mass % of hydrogen=12300/2103
mass by mass % of hydrogen =5.85%