Water consists of hydrogen and oxygen, and the approximate ratio, by mass, of hydrogen to oxygen is ...

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 126 grams of water?

Quiz

Answer/Solution

112

Steps/Work

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 126 grams of water.
2x + 16x = 126
18x = 126
x = 7
Since x is 7, we know that there are 16 x 7 = 112 grams of oxygen in 126 grams of water.
Answer C.

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Water consists of hydrogen and oxygen, and the approximate ratio, by mass, of hydrogen to oxygen is : . Approximately how many grams of oxygen are there in grams of water?

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