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06/10/2020 12:16 pm
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ΔH°f (298K) of methanol is given by the chemical equation :
(a) CH4(g) + 1/2O2(g)→ CH3OH(g)
(b) C(graphite) + 1/2O2(g) + 2H2 → CH3OH(l)
(c) C(diamond) + 1/2O2(g) + 2H2(g) → CH3OH(l)
(d) CO(g) + 2H2(g) → CH3OH(l)
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06/10/2020 12:17 pm
(b) C(graphite) + 1/2O2(g) + 2H2 → CH3OH(l)
Explanation:
Heat of formation is defined as the heat exchange when one mole of a compound is formed from its constituent elements at STP. In case of allotropes, most stable allotrope is taken into account. Among graphite and diamond, graphite is stable. Hence, heat of formation of CH3OH is represented by the eqn.
C(graphite) + 1/2O2(g) + 2H2 → CH3OH(l)