Question 518: Thermodynamics & KTG

Question

$$100g$$ of water is heated from $${30^ \circ }C$$ to $${50^ \circ }C$$. Ignoring the slight expansion of the water, the change in its internal energy is (specific heat of water is $$4184$$ $$J/kg/K$$):

Accepted Answer

$$\Delta U = \Delta Q = mc\Delta T$$
$$ = 100 	imes {10^{ - 3}} 	imes 4184\left( {50 - 30} ight) \approx 8.4\,kJ$$

Answer

$$8.4$$ $$kJ$$

Answer

$$84$$ $$kJ$$

Answer

$$2.1$$ $$kJ$$

Answer

$$4.2$$ $$kJ$$

Thermodynamics & KTG

100g of water is heated from {30^ \circ }C to {50^ \circ }C. Ignoring the slight expansion of the water, the change in its internal energy is (specific heat of water is 4184 J/kg/K$):

Choose the correct answer: