First slide

Questions on calorimetry without phase change

Question

30 gms of water at 30^oC is in a beaker. Which of the following, when added to water, will have greatest cooling effect? (Specific heat of copper = 0.1 cal/gm^oC)

Easy

A

100 gms of water at 10^oC
B

15 gms of water at 0^oC
C

3 gms of ice at 0^oC
D

18 gms of copper at 0^oC

Solution

Since 'ms' is maximum for 100gm of water, amount of heat taken by 100g of water at 10⁰ C will be maximum so it will have greatest cooling effect

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