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Worksheet 3 . Topic 1

Set C continues
13. How much heat is released by 38 gram
sample of water to freeze?

14. Calculate the number of joules of heat needed to
change a 25 g sample of water to steam at its boiling point.

15. How much heat is absorbed by a 170 gram
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sample of ice to melt at 0 C?

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16. The specific heat capacity of a substance is 15 J/g. C.
How much heat would be released by a 25 g sample of
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o
this substance to cool from 100 C to 90 C?

17. Substance Y has a heat of fusion of 3.5 KJ/g. How much
heat would a 30 gram sample of substance Y absorbs
to melt at its melting point?

18. Propane has a heat of vaporization of 356 Joules per gram.
How much heat is needed to completely evaporate a
40 gram sample of propane at its boiling temperature of 230K?

19. If 5000 J is required to evaporate 36 grams of a liquid at
constant temperature. What is the heat of vaporization
of the liquid?

20. A student determined that a sample of water absorbed
2200 joules of heat when it changed its temperature from
47 C to 59 C. What is the mass of the water sample?
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o

21. A 5.7 g sample of copper absorbed 1023 J of heat to melt
at its melting point. What is the heat of fusion of copper?

22. What is the specific heat capacity of an unknown substance
if 10 grams of the substance absorbed 550 J of heat to
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change from 26 C to 33 C?

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