Chemistry

Chemistry

Problem

The following thermochemical equations are given: (1) C(graphite) + O₂(g) → CO₂(g)  ΔH = –393.5 kJ (2) H₂(g) + 12\tfrac{1}{2}O₂(g) → H₂O(l)  ΔH = –285.8 kJ (3) CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(l)  ΔH = –890.3 kJ Using these data, determine ΔH for the formation reaction C(graphite) + 2H₂(g) → CH₄(g). a) +211 kJ+211\text{ kJ} b) −497 kJ-497\text{ kJ} c) −74.8 kJ-74.8\text{ kJ} d) +74.8 kJ+74.8\text{ kJ}

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