Question

3. A litre of water with mass of 1 kg is heated from 0 oC to 100 oC. Calculate the increase in entropy. Assume that the specific heat capacity of water is C = 4184 J kg−1 K−1, that it does not vary significantly through the temperature range of the question.

Answer 1

Solution.

$m=1kg;$

$T_1=273K;$

$T_2=373K;$

$c=4184J/kgK;$

$\Delta S=2.303c\sdot lg\dfrac{T_2}{T_1};$

$\Delta S=2.303\sdot4184\sdot0.136=1310J/K;$

Answer: $\Delta S=1310J/K.$