Question

A temperature of a 0.25 kg sample of copper decreases from 75.0 °C to 25.0 °C. How much heat flows out of the copper sample?

Answer 1

Answer:

2.96 x 10^6 J 3. A temperature of a 0.25 kg sample of copper decreases from 75.0 °C to 25.0 °C. How much heat flows out of the copper sample? -4875 J 4. When 8,000 joules of heat are removed from a sample of mercury, the temperature of the sample is decreased from 40 °C to 15 °C.

Answer 2

Answer:

48.12 KJ

Explanation:

mass(m)=0 25 Kg=2500 gm

change in temp (∆T)=75-25=50 ° C

specific heat capacity of cu =0.385 J/gm C

Now

Heat flow (∆Q) = mc∆T=2500 × 50 × 0.385=48,125

Heat flow is 48,125 joule =48.12 KJ