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Question

The water equivalent of a copper calorimeter is 4.5 g. If specific heat of copper is 0.09cal/g/0C, then (Lf=80cal/gm)

A
Mass of the calorimeter is 0.5 kg
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B
Thermal capacity of the calorimeter is 4.5cal0/C
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C
The heat required to raise the temperature of the calorimeter by 80C will be 36 cal.
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D
Heat required to melt 15 gm of ice at 0oC Placed in the calorimeter will be 1200 cal
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Solution

The correct options are
A Thermal capacity of the calorimeter is 4.5cal0/C
C The heat required to raise the temperature of the calorimeter by 80C will be 36 cal.
(A) ms=4.5
m(0.09)=4.5
m(9100)=4510
m=50gm=0.5kg
(B)water equivalent =msSw
Heat capacity=4.5×1=4.5cal/0C
(C) Q=MSΔT
=4.5×1×8
=36cal
Hence,
option (B) and (C) are both correct answer.

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