7 How many calories were needed to melt the solid? 2eno calo ulo TA order to mel

Question

7 How many calories were needed to melt the solid? 2eno calo ulo TA order to melt solid o" needed 8. From your answer to CTQ 7, calculate the calories used per gram (cal/g) of this substance in order to melt it. Include units. This quantity is known as the heat of fusion of the substance. 9. How many calories were needed to change the liquid to a gas? 100 CalS 10. From your answer to CTQ 9, calculate the calories used per gram (cal/g) of this substance to vaporize it. Include units. This quantity is known as the heat of vaporization of the substance. 11. How many calories were needed to warm the liquid from point w to point x? CA20

Explanation / Answer

Ans7:Melting point of any substance is equal to its freezing point. According to graph the melting point of the solid is 0°c.

Heat required to melt the solid= (heat required for UV +heat required for VW)= 0.76×500+3.04×500

= 3040 Cal/19 g

Ans 8: Heat of fusion =3040/19

= 160 Cal/g

Ans9:Heat required to change the substance from liquid to gas= 3.8×500+0.63×500= 2215 Cal/19 g.

Ans10:Heat of vaporisation= 1900+0.63×500/19

= 1900+315/19=116.57 Cal/g

Ans11: Heat required from W to X = 3.8×500= 1900 Cal/19g

Or 1900/100=100 Cal/g

Ans12:Temperature change from W to X= 100°c

Ans13:Q = ms t

S is specific heat = 2215/19×100=1.16 Cal/g-°c

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