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In which of the following is ΔH°rxn = ΔH°f at 1 atm and 298 K?

C (s, graphite) + 2 H2 (g) + ½ O2 (g) → CH3OH (l)

2 C (s, graphite) + 4 H2 (g) + O2 (g) → 2 CH3OH (l)

C (s, graphite) + H2 (g) + O2 (g) → CH3OH (l)

C (s, graphite) + 2 H2 (g) + ½ O2 (l) → CH3OH (l)

C (s, graphite) + 4 H (g) + ½ O2 (g) → CH3OH (l)

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  • 3 years ago
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    The first one is correct.

    2 C (s, graphite) + 4 H2 (g) + O2 (g) → 2 CH3OH (l) is wrong because it shows two moles of product.

    C (s, graphite) + H2 (g) + O2 (g) → CH3OH (l) is wrong because the H atoms are not balanced

    C (s, graphite) + 2 H2 (g) + ½ O2 (l) → CH3OH (l) is wrong because the standard state for O2 is (g)

    C (s, graphite) + 4 H (g) + ½ O2 (g) → CH3OH (l) is wrong because hydrogen gas is H2.

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