Substance X has a vapor pressure of 100 mm Hg at its triple point...

Question

Substance X has a vapor pressure of 100 mm Hg at its triple point (48 °C). When 1 mol of X is heated at 1 atm pres- sure with a constant rate of heat input, the following heating curve is obtained: (b) For each of the following, choose which phase of X (solid, liquid, or gas) fits the description. (iii) Has the greatest specific heat

Accepted Answer

Hello everyone in this video. We're given this heating curve here and it's produced when one mole of substance M is heated at 1 80 M pressure when heat is applied at a constant rate, the first thing to do is go ahead and label the states on this heating curve. So of course, we're starting off with the material being a solid than to a liquid than to a gas. And these horizontal lines here, that's just a flat and constant as temperature. That's our transition phases from the first one being from solid to liquid. Second one being from liquid to gas. So here this problem bring asks which phase of solid liquid or gas has the highest specific heat. So taking a look at the curve, we can see that the liquid state of our substance M has the highest specific heat. It's actually scroll down so we can actually write some notes as well. Alright, let's go ahead and maybe do it here. So we also see the graph. So we can see that the liquid ST of substance M as the highest specific heat. And this can be verified from background knowledge because gasses have the lowest so gasses have the lowest specific heat. So it takes longer to convert liquid two gas. So again, if we look at this heating curve that we have this line here from liquid to gas is definitely longer than our solid going to liquid. So our final answer is going to be like the liquid face has the highest specific heat. So the answer is liquid and this right here is going to be my final answer for this problem.

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