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4) Qa-b = m. ces. T
= 100 g. 0,5 kal/g C . 5
= 250 kal
Qb-c = m. L
= 100g. 80 kal/g
= 8000 kal
Qc-d = m.c air. T
= 100 g. 1 kal/g C. 40
= 4000 g
Q = 12.250 kal
= 12,25 Kkal
6) W= Rf. s
= (100-50). 0,5
= 50. 0,5
= 25 J