A- The heat capacity of an object is: 1. the amount of heat energy that raises i

Question

A- The heat capacity of an object is:

1. the amount of heat energy that raises its temperature by 1°C
2. the amount of heat energy that changes its state without changing its temperature
3. the amount of heat energy per kilogram that raises its temperature by 1°C
4. the ratio of its specific heat to that of water
5. the change in its temperature caused by adding 1J of heat

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B- The energy given off as heat by 226 g of an alloy as it cools through 58.4 °C raises the temperature of 216 g of water from 32 °C to 42.5 °C. The specific heat of the alloy (in cal/g .°C ) is: The heat of fusion of water is 333 kJ/kg and the specific heat of water is 4190 J/kg.K. (Give the answer in three significant figures and SI units)

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C- How many calories are required to change 0.885 gram of 31.4 °C ice to 100°C steam? The latent heat of fusion is 80 cal/g and the latent heat of vaporization is 540 cal/g. The specific heat of water is 1.00 cal/g. K.(Give the answer in three significant figures and SI Units)

Explanation / Answer

A 3. the amount of heat energy per kilogram that raises its temperature by 1°C

B)

m_alloy C_alloy T = m_water C_water T

226*C_alloy*58.4 = 216*4190*10.5

C_alloy = 720.005 J/kg.K

C_alloy =3.024 cal/g.K

C) total heat required = ice to water + water to 100 + water to steam

Q = .885( 80+ 1*68.6+ 540)

Q = 609.411 cal = 145.098 J

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