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7. Find the heat lost from 2.5 kg of water when its temperature is dropped from 100 °C to 35 °C.
(Specific heat capacity of water = 4200 J/kg°C).
Answer: 682,500J @ 682.5KJ
8. A 400g drinking glass is filled with a hot chocolate. The hot chocolate transfers 7250 J of heat to
the glass. If the temperature of the glass increases by 4°C, calculate the specific heat capacity of
the glass.
-1
Answer: 4531.25 Jkg °C -1
o
9. Calculate the amount of heat needed to increase the temperature of 250g of water from 20 C to
o
46 C.
Answer: 37,300J
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