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Tc/Tf × Suhu
=5/9 × 49 = 27,2 (c)
4.A ke D
#A ke B(menaikan suhu)
= Q = m.c.∆t
= 3kg×2100j/kg°c×10°c
= 63.000j
#B ke C(mencairkan es)
=Q = m.L
= 3kg×336.000j/kg
= 1.008.000j
# C ke D(menaikan Suhu)
=Q = m.c.∆t
= 3kg×4200j/kg°c×80°c
=1.008.000j
jadi kalor yg diperlukan untuk proses A-D=
63.000j + 1.008.000j + 1.008.000j=2.079.000j
= 2079kJ (D)
itu aja yg bisa saya jawab
semoga membantu:)