Paper 2 · thermochemistry / Born-Haber cycle

The standard enthalpy change of combustion of hydrogen is $-286\ kJ\,mol^{-1}$ . The thermochemical equation for this change is

H_2(g) + O_2(g) \rightarrow H_2O(l)

H_2(g) + \frac{1}{2}O_2(g) \rightarrow H_2O(g)

H_2(g) + \frac{1}{2}O_2(g) \rightarrow H_2O(l)

2H_2(g) + O_2(g) \rightarrow 2H_2O(l)

Explanation: One mole of hydrogen is burned completely under standard conditions, and the water formed is a liquid at 298 K.

Derived from ZIMSEC Chemistry Paper 2, November 2002, Q1

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