Heat is added to a 1.0-kg solid sample of a material at Which one of the followi

Question

Heat is added to a 1.0-kg solid sample of a material at

Which one of the following statements concerning this substance is true? ANSWER: It can coexist as a solid and a liquid at -50 degree C (WHY?) What is the latent heat of fusion of this material? ANSWER: 100c/g What is the latent heat of vaporization of this material? ANSWER: 150 cal/g What is the specific heat capacity of this substance in its solid state? ANSWER: 0.33 cal/(g · C degree) What is the specific heat capacity of this substance in its liquid state? ANSWER: 0.75 cal/(g · C degree)

Explanation / Answer

a)

At -50 C the gas strats converting into liquid state so both the forms co-exist.

b)

heat added during the fusion is 150 - 50 = 100 Kcal/Kg

so, the latent heat of fusion of this material = 100 cal/g

c)

heat added during the vapourization is 450 - 300 = 150 Kcal/Kg

so, the latent heat of vapourization of this material = 150 cal/g

d)

1Kg*(s)*(-200+50) = 50 Kcal

s = 50/150 = 0.33 cal/(g

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