Question

O 81% E all VZW Wi-Fi 12:57 Exit 12 3. A 65.0 g piece of chromium [cp 0.449 J/(g °C)] is heated to a temperature of 120.0°C and then placed in contact with a 95.0 g piece of zinc at 20.0°C [cp 0.387 J/(g C). What is the final temperature of the two pieces of metal? 70°C 42°C 64°C 47°C 83°C

Answer 1

Answer :- 64^oC

explaination:-

Since

q_lost.metal = q_gained.zinc

we write

(mass) (∆t) (C_p.metal) = (mass) (∆t) (C_p.zinc)

C_p.metal = 0.45 where , metal = chromium

C_p.zinc = 0.387

(65) (120 - x) (0.45) = (95) (x-20) (0.387)

(65 X 0.45) / (95 X 0.39) = (x-20) / (120 -x)

(0.7894) X (120) + 20 = x. (1.7894)

x = 64.1^o C

therefore final temperature of two piece of metal = 64^o C

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