100 g of water is heated from 30°C to 50°C

• Solids Fluids

100 g of water is heated from 30°C to 50°C ignoring the slight expansion of the water, the change in its internal energy is (specific heat of water is 4184 J/Kg/K)

1. 2.1 kJ
2. 4.2 kJ
3. 8.4 kJ
4. 84 kJ

Answer

ΔQ = MSΔT = 100 x 10^-3 x 4.184 x 20 = 8.4 X 10³

ΔQ = 84 kJ, ΔW = 0

ΔQ = ΔV + ΔW

V = 8.4 kJ

The correct option is C.