AP Chemistry· difficulty 2/5
A 200.0 g sample of water is heated by an electric heater that delivers a constant 50 W. Time vs temperature data are recorded.
What value of c_water (J/g·°C) is implied?
12.0 J/g·°C
0.060 J/g·°C
50 J/g·°C
4.17 J/g·°C
Explanation
P = mc(dT/dt). c = P/[m(dT/dt)] = 50/(200·0.060) = 50/12 = 4.17 J/g·°C, matching water's known value.
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