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Q.

4 grams of Hydrogen react with 40 grams of Oxygen to form water. Excess reagent in the reaction is _____

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a

8g of O2

b

4g of O2

c

2g of H2

d

0.5g of H2

answer is A.

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Detailed Solution

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Alternatively: 4 gm H2 = 4 equivalents which react with 4 equivalents of O2, 32 gms. 

Mass of excess O2 = 40  - 32  = 8gm.

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