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 153 grams of water?  Select the correct option: A) 16 B) 72 C) 112 D) 136 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   153*8/9= 
<gadget id="calculator">  153*8/9</gadget>
<output>136</output>
136 grams of oxygen in 153 grams of water.   Answer: 136.
<result>D</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 153 grams of water?