Question

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12. In water, hydrogen and oxygen are in the ratio 2 : 1. Find the percentage of hydrogen in water.
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Answer 1

Answer:

11.11%

Step-by-step explanation:

mass of 2 H = 2

mass of 1 O = 16

so mass of water =16+2=18

percentage of hydrogen=2*100/18

= 200/18

=11.11%

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Answer 2

Step-by-step explanation:

percentage of oxygen is 30 % because the ratio of the percentage of oxygen :hydrogen is 2:1 in 100%of molecule ,i. e., 75%:30%