Question

un químico quiere calcular la cantidad de calor que absorbe una muestra de cobre al fundirse. ¿qué constante debe usar? δhfus -δhvap δhvap -δhfus

Explanation:

The heat absorbed during melting is given by the enthalpy of fusion ($\Delta H_{fus}$). Enthalpy of vaporization ($\Delta H_{vap}$) is related to the transition from liquid to gas. The negative of these values would be for the reverse - processes. Since we want the heat absorbed during melting of copper, we use $\Delta H_{fus}$.

Answer:

$\Delta H_{fus}$