Answer to Question #131854 in General Chemistry for javier

Question

kilocalories to condense 5.0 kg of steam

Answer 1

The heat released when condensing steam can be expressed as

$Q = h_eM_s$

where

Q – quantity of heat released (kJ)

M_s – mass of condensing steam (kg)

h_e – specific condensation/evaporation enthalpy of steam (kJ/kg)

The heat of condensation of water is about 2260 kJ/kg

$Q = 2260 \frac{kJ}{kg}\times5.0kg = 11300 kJ = 2700 kcal$

Answer: 2700 kcal