Question

Allicin (C6H10OS2) contains 59.9 g of carbon, 21.7 g of hydrogen, 24.4 g of oxygen, and sulfur. What is the mass percent of sulfur in a 162 g sample of the compound?
a) 13.40%
b) 15.06%
c) 21.04%
d) 34.57%
e) 36.98%

Answer 1

162 - 59.9 - 21.7 - 24.4 = 56
56/162 = 0.34567.. 
0.34567* 100 = 34.57%
D

Answer 2

Allicin (C6H10OS2) contains 59.9 g of carbon, 21.7 g of hydrogen, 24.4 g of oxygen, and sulfur. What is the mass percent of sulfur in a 162 g sample of the compound?

A.  13.40% ( way to low)

B.  15.06% ( also to low )

C. 21.04% ( if you got this answer, recheck your work. you may have missed a step or done a step wrong )

D.  34.57% (the correct answer)

E.  36.98% ( if you got this answer, recheck your work. you may have missed a step or done a step wrong )