Question

Tolong dijawab yaaa!!! pakai cara.^_^

Answer 1

Diketahui:
m = 500 g = 0,5 kg
c es = 2.100 J/kg°C
l es = 336.000 J/kg

Ditanyakan:
Q total (P-Q-R) = ...?

Dijawab:
P-Q
= m · c · ΔT
= 0,5 · 2.100 · (0-(-4))
= 4.200 Joule

Q-R
= m · l
= 0,5 · 336.000
= 168.000 Joule

Maka, Q total adalah
= PQ+QR
= 4.200 + 168.000
= 172.200
= 172,2 kJ (C)

Answer 2

Massa = 500 g ➡ 0,5 kg
∆T = T2 - T1 = 0 - (-4) = 4°C

P-Q = m × Ces × ∆T
= 0,5 × 2100 × 4 = 4200 J

Q-R = m × L
= 0, 5 × 336.000 = 168.000 J

P-Q-R = 4200 + 168.000 = 172.200 J