Question

How much heat is needed to raise the temperature from 25oC to 50oC of 5kg

of substance? The specific heat capacity of the substance is 300J/kgoC

Answer 1

The heat, needed to change the temperature of substance with specific heat capacity $c$ by $\Delta T$ degrees is $Q = c m \Delta T$.

Hence, $Q = 300 \frac{J}{kg \cdot ^{\circ} C} \cdot 5 kg \cdot (50^{\circ} C - 25 ^{\circ} C) \approx 37.5 \cdot 10^3 J = 37.5 kJ$.