Question

A copper block is removed from a 300°C oven and dropped into 1.00 kg of water at 20.0°C, which is located in an aluminum container of a mass of 0.250 kg. The system quickly reaches 25.5°, and then remains at that temperature. a) What is the mass of the copper block? b) How much energy did the copper block lose? c) How much energy did the water gain? d) As the temperature of water rises, the temperature of the copper block decreases. What is the temperature of the copper block at the instant that the temperature of water is 22.0°C?

Answer 1

Guapper = 0.39 kulkek Mw=1kg MAI= 0-25 Cwater = 4.18 Kulkgle Caluminium 0.9 kJ/kgle Heat losses Heat gain by + by cu block water Headgain Al contain by MX0-39x1300-455 = 410x1x255-20) +0.25X0.9(25-5-20) m= 0.226 226kg Heat losses by cu block mx 57 = 0-226x0.39X(300-25-5) = 24.19493 KJ ANS 4.18X1 x (25.5-20) Energy gain by water = 22.99 KJ ANS d) 0.226X0-39x (300-1) = (4.-10x1)(22-20) +0-2520.97(22-20) T= 200-0450 A csscanned with CamScanner