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t1 = -5°C
t2 = -1°C
c = 0,5 kal/gr°C
Ditanya : Q?
jawab. : Q = m.c.∆t
Q = 200.0,5.[-1-(-5)]
Q = 100.4
Q = 400 kalori
atau 400 kal = 400/10³ kkal
= 0,4 kkal