Question

Hydrogen and oxygen react to produce water according to the following equation.

2H2+O2→2H2O


The molar mass of hydrogen gas ( H2
) is 2 g/mol
. The molar mass of oxygen gas ( O2
) is 32 g/mol
. When the reaction starts with 64
grams of oxygen and a sufficient quantity of hydrogen, how many moles of water are produced?

(1 point)
Responses

8

8

18

18

4

4

2

2
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Answer 1

Moles O2 = 64 g / 32 g·mol⁻¹ = 2 mol.
From 2H2 + O2 → 2H2O, 1 mol O2 gives 2 mol H2O, so 2 mol O2 gives 4 mol H2O.

Answer: 4.