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Question

How many grams of oxygen (O2) are required to completely react with 0.20 g of hydrogen (H2) to yield water (H2O)? (molar mass H2=2 g/mol,O2=32 g/mol)

A
1.6
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B
2
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C
0.8
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D
3.2
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Solution

The correct option is A 1.6
According to the reaction:
2H2(g)+O2(g)2H2O(l)
4 g of hydrogen reacts with 32 g of oxygen.
So, 0.2 g of hydrogen reacts with (324×0.2)=1.6 g of oxygen

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