How much heat, in calories, is given off when 1.25 grams of silver is cooled from 100.0°c to 80.0°c? (the specific heat of silver is 0.057 cal/g°c)
1.43 cal
0.0713 cal
5.70 cal
7.13 cal

The correct answer is 1.43 cal.

Explanation:

The expression of heat in terms of mass and temperature is as follows;

Here, Q is the heat, m is the mass of the object and is the change in temperature.

It is given in the problem that 1.25 grams of silver is cooled from 100.0°C to 80.0°C.

Calculate the change in temperature.

Calculate the heat in calories.

Put m= 1.25 grams,  and c=0.057 cal/g°C.

Q= 1.43 cal

Therefore, the amount of heat is  1.43 cal.

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