For a substance with and at

CHEMISTRY · Subjective · AP · Chemistry · Thermochemistry · Thermochemistry

Problem

For a substance with

\Delta H_{fus} = 5.4\,\text{kJ mol}^{-1}

and

\Delta H_{vap} = 25.9\,\text{kJ mol}^{-1}

1\,\text{atm}

2.00\,\text{mol}

of the liquid at its melting point is first solidified and the resulting solid is then sublimed directly to gas at the same temperature. Determine the net enthalpy change (in

\text{kJ}

) for the overall two-step process and state whether it is endothermic or exothermic.

Related theory

Thermodynamics

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