Step 1: The standard enthalpy of formation of water at 1000 K can be calculated using the following equation:
$\Delta H_f^\circ(H_2O, 1000 K) = \Delta H_f^\circ(H_2O, 298 K) + \int_{298 K}^{1000 K} C_{p,m}(H_2O) dT$
where $\Delta H_f^\circ(H_2O, 298 K)$ is the
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