heat required
H = mc (T2 - T1)
H = 1 (185-25) c
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a) for iron, c = 448 J/kgC
H = 71680 J
b)
for copper, c = 387 J/kg C
H = 61920 J
c)
for gold, c= 129 J/kgC
H = 20640 J
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