Answer:
3.824 %
Explanation:
Let’s rewrite the formula as CaC₄H₆O₄ and calculate the mass of each component,
Element Atomic mass/u No. of atoms Subtotal mass/u
Ca 40.08 1 40.08
C 12.01 4 48.04
H 1.008 6 6.048
O 16.00 4 64.00
Total mass = 158.17
The formula for mass percent is
% by mass = mass of component/motal mass × 100 %, or
% H = mass of H/mass of Ca(C₂H₃O₂)₂ × 100 %
Mass of H = 6.048 u
Mass of Ca(C₂H₃O₂)₂= 158.17 u
% H = 6.048/158.17 × 100
% H = 0.038 24 × 100
% H = 3.824 %
