ThermodynamicsMedium
Question
100g of water is heated from 30oC to 50oC. Ignoring the slight expansion of the water, the change in its internal energy is (specific heat of water is 4148 J/kg/K):
Options
A.8.4 kJ
B.84 kJ
C.2.1 kJ
D.4.2 kJ
Solution
ᐃQ = ᐃU + ᐃW (ignoring expansion)
ᐃU = msᐃ T = 0.1 × 4.184 × 20 = 8.368 kJ
ᐃU = msᐃ T = 0.1 × 4.184 × 20 = 8.368 kJ
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