thanks ! A mass of 20 g of a solid initially at -40 degree C is heated at consta

Question

thanks !

A mass of 20 g of a solid initially at -40 degree C is heated at constant pressure. The figure shows the graph of temperature vs. added heat (in Kcal) from -30 degree C to +60 degree C. What is the latent heat of vaporization? 25 cal/g -40 cal/g 20 cal/g 40 cal/g -50 cal/g 50 cal/g A student uses a constant volume gas thermometer to attempt to determine absolute zero. Two data points are taken, A and B, as shown, and the student draws the line indicated in the figure. Which of the following statements must be true (assuming the values assigned to the temperatures are correct)? The ratio PB/PA is too small. The point PB is too high. Both pressure measurements are wrong. The ratio PB/PA is too large The point PA is too low. The absolute temperature of an ideal gas is directly proportional to the number of molecules in the sample. the average momentum of a molecule of the gas. the average translational kinetic energy of the gas. the relative increase in volume of the gas tor a temperature increase of 1 C degree .

Explanation / Answer

1) latent heat is length of plateau

so 1kcal/20 g = 50 cal/g

2) so the point it hits the axis is not far enough to the left

so the slope should be less
so B) the ration of PB/PA is too large

3) C) average KE

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