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)

5

2

4

8
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Answer 1

4

Explanation: 2 H2 molecules contain 4 hydrogen atoms. The product 2 H2O also contains 2 × 2 = 4 hydrogen atoms (atoms are conserved).