Answer
$q=2133.4\ kJ/kg$
Work Step by Step
Since this process occurs at constant pressure (quasi-equilibrium), the energy balance reduces to:
$q=\Delta h$
From the steam table:
$h_2 = 604.66\ kJ/kg,\ h_1=2738.1\ kJ/kg$
Therefore:
$q=2133.4\ kJ/kg$
