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 117 grams of water?  Choose the correct choice from the following.
A) 16  B) 104  C) 112  D) 128  E) 142
Since the ratio, by mass, of hydrogen to oxygen is 2:16, then oxygen is 16/(2+16)=8/9 of mass of water.   Therefore there are   117*8/9= 
<gadget id="calculator">  117*8/9</gadget>
<output>104</output>
104 grams of oxygen in 117 grams of water.   Answer: 104.
<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 117 grams of water?