Water consists of hydrogen and oxygen, and the approximate ratio, by mass, of hydrogen to oxygen is 2:16. Approximately how many grams of oxygen are there in 108 grams of water?  Choose the correct choice from the following answers:	A) 16	B) 96	C) 112	D) 128	E) 142
Solution:   We are given that the ratio of hydrogen to oxygen in water, by mass, is 2 : 16. Using our ratio multiplier we can re-write this as 2x : 16x. We can now use these expressions to determine how much oxygen is in 108 grams of water.   2x + 16x = 108   18x = 108   x = 6   Since x is 6, we know that there are 16 x 6 = 96 grams of oxygen in 108 grams of water.   Answer 96.
<result>B</result>
Water consists of hydrogen and oxygen, and the approximate ratio, by mass, of hydrogen to oxygen is 2:16. Approximately how many grams of oxygen are there in 108 grams of water?