exam 3: 4.2 (molecular and empirical formula)

Question 1

how to calculate the mass percent composition?

Answer 1

mass % of element = (mass of x in a sample of the compound/mass of the sample of the compound) x 100

Question 2

calculate the mass percent for each element:
C2H6O

Answer 2

%C = 52.14%
%H = 13.15%
%O = 34.72%

Question 3

calculate the mass percent for:
Na3PO4

Answer 3

%Na = 42.07%
%P = 18.89&
%O = 39.04%