Question 461: 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: