Combustion analysis of an unknown compound provides the following data: 73.5 grams C, 4.20 grams H, and 72.3 grams Cl. What is the percent composition of each element in this compound?
A) 73.5% C, 4.20% H, 72.3% Cl
B) 48.0% C, 3.00% H, 50.0% Cl
C) 17.5% C, 1.00% H, 17.2% Cl
D) 49.0% C, 2.80% H, 48.2% Cl

Question

Combustion analysis of an unknown compound provides the following data: 73.5 grams C, 4.20 grams H, and 72.3 grams Cl. What is the percent composition of each element in this compound?
A) 73.5% C, 4.20% H, 72.3% Cl
B) 48.0% C, 3.00% H, 50.0% Cl
C) 17.5% C, 1.00% H, 17.2% Cl
D) 49.0% C, 2.80% H, 48.2% Cl

matt6288 · Answer

all it is asking is for mass %. Add the masses of all the elements, and find the percentages by mass

matt6288 · Answer

You have 73.5 grams C, 4.20 grams H, and 72.3 grams Cl
added together it is 150 g so composition is:
C 73.5/150 = 0.49 x 100% = 49%
H 4,20/150 = 0.028 x 100% = 2.8 %
Cl 72,3/150 = 0.482 x 100% = 48.2 %
It's D