Water consists of hydrogen and oxygen, and the approximate ratio, by mass, of hydrogen to oxygen is 2:16. Approximately how many grams of hydrogen are there in 117 grams of water?
Choose one
A) 7
B) 9
C) 11
D) 13
E) 15

Rationale: ( 2 / 18 ) * 117 = 13 grams the answer is d .
Answer: D