Q.

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

Moderate

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answer is 1.

(Detailed Solution Below)

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Detailed Solution

Alternatively: 4 gm H2 = 4 equivalents which reacts with 4 equivalents of O2, 32 gms. Mass of excess O2 = 40 - 32 = 8gm.

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