Balance the equation: H2 + O2 -> H2O. If you start with 4 H2 and 2 O2, how many H2O molecules form?

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Multiple Choice

Balance the equation: H2 + O2 -> H2O. If you start with 4 H2 and 2 O2, how many H2O molecules form?

Explanation:
In this reaction, the balanced form is 2 H2 + O2 -> 2 H2O. For every 2 hydrogen molecules, 1 oxygen molecule is needed and 2 water molecules are produced. With 4 H2 available, you need 2 O2 to use it all, and you indeed have 2 O2. Since both reactants run out together, the amount of water formed scales with the hydrogen: 4 H2 produces 4 H2O. Therefore, 4 water molecules form.

In this reaction, the balanced form is 2 H2 + O2 -> 2 H2O. For every 2 hydrogen molecules, 1 oxygen molecule is needed and 2 water molecules are produced. With 4 H2 available, you need 2 O2 to use it all, and you indeed have 2 O2. Since both reactants run out together, the amount of water formed scales with the hydrogen: 4 H2 produces 4 H2O. Therefore, 4 water molecules form.

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