Question

Use the chemical reaction to answer the question.

2H2+O2→2H2O


There are four atoms of hydrogen ( H
) before the reaction. How many atoms of hydrogen are present after the reaction?

(1 point)

8

4

5

2
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Answer 1

4

Atoms are conserved. 2 H2 molecules = 4 H atoms, and 2 H2O molecules also contain 2 × 2 = 4 H atoms.