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Excess Reagent: Oxygen and Hydrogen

APCHEM-ECYZXZ

3.0 moles of oxygen gas react with 3.0 moles of hydrogen gas to produce water vapor.

What is the total moles of gas present at the end of the reaction?

A

1.5 moles of gas are present.

B

2.5 moles of gas are present.

C

3.0 moles of gas are present.

D

4.5 moles of gas are present.