To determine which molecule shows two atoms of hydrogen (H), let's analyze each option:
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2H2O: This represents 2 molecules of water. Each water molecule (H2O) has 2 hydrogen atoms, so 2H2O has a total of 2 x 2 = 4 hydrogen atoms.
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HO2: This molecule has 1 hydrogen atom (H) and 2 oxygen atoms (O), totaling 1 hydrogen atom.
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2CH4: This represents 2 molecules of methane (CH4). Each methane molecule has 4 hydrogen atoms, so 2CH4 has a total of 2 x 4 = 8 hydrogen atoms.
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H2SO4: This molecule (sulfuric acid) has 2 hydrogen atoms, as indicated by the subscript '2' before sulfur (S) and oxygen (O).
Based on this analysis, H2SO4 is the correct response, as it shows exactly two hydrogen atoms.