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Question

The ratio of hydrogen and oxygen by mass in water is:
  1. 8:1
  2. 1:8
  3. 2:1
  4. 1:2

A
1:8
B
8:1
C
1:2
D
2:1
Solution
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The ratio of hydrogen and oxygen by mass in water is 1:8. The atomic masses of H and O are 1 g/mol and 16 g/mol respectively. In H2O, the ratio of hydrogen and oxygen by mass will be 2:16=1:8.

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