How many liters of Oxygen are needed to completely reac... – Chemistry

Chemistryhard · Past Paper

How many liters of Oxygen are needed to completely react with 22.4L of Hydrogen to form water vapor at STP?

A22.4 L

B11.2 L

C44.8 L

D5.6 L

✓ Correct Answer: B — 11.2 L

Equation $2H_2 + O_2 \rightarrow 2H_2O$ shows 2 volumes of H2 react with 1 volume of O2. Thus 22.4L H2 needs 11.2L O2.

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