39.5J/kgoC
50.4J/kgoC
127.6J/kgoC
154.6J/kgoC
173.4J/kgoC
Correct answer is C
Heat lost = heat gained
0.25 x C1 x (170 - 12) = 0.1 x 4200 x (12 - 0)
C1 = 127.6J/kgoC
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