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The following information is given for ethanol; C_HsOH, at latm:boiling point = 78.4 AH ap(78.4 C) 38.6 klmol specific heat liquid = 2.46 JgCAt 2 pressufe Of atm; ...

Question

The following information is given for ethanol; C_HsOH, at latm:boiling point = 78.4 AH ap(78.4 C) 38.6 klmol specific heat liquid = 2.46 JgCAt 2 pressufe Of atm; What is AH in k] for the process of condensing 25.6 sample of gaseous ethanol at its norma boiling point of 78.4 *C.

The following information is given for ethanol; C_HsOH, at latm: boiling point = 78.4 AH ap(78.4 C) 38.6 klmol specific heat liquid = 2.46 JgC At 2 pressufe Of atm; What is AH in k] for the process of condensing 25.6 sample of gaseous ethanol at its norma boiling point of 78.4 *C.



Answers

The molar heat of vaporization of ethanol is 39.3 $\mathrm{kJ} / \mathrm{mol}$ and the boiling point of ethanol is $78.3^{\circ} \mathrm{C}.$ Calculate $\Delta S$ for the vaporization of $0.50 \mathrm{mol}$ ethanol.

It's this system with some of the earlier promise we've done where we've had Dr G equals Delta Asia minus T Delta s. But since we're looking at a boiling point, which you just like anything's transition, that tells us that Delta G is gonna be zero and so we can solve for both felt age Delta you We have a way. Three variables. We get two of them. So we have tell to age equals t Delta. After standing adults asked about sides in this case, we're looking for his job to ask. And so we take Delta H over Team Delta H is 39 39.3 tillage ALS promote. But generally speaking, this is given to us and jewels from all asked. So where is going to, uh, multiplied by thousands? Get into jewels on our temperature. Here is 78.3 degrees Celsius. But we want this in Calvin. So we're just gonna add to 73 to that. And so that's good that you that full things going, being helped. I don't see if you plug this in. We're gonna find that Delta ask not is equal to 111 0.8 jewels Promote help. It's this that crack Tunis for adults asking now this. We're not done yet. Exactly. Because we're not asked with the standard adults s is in other words, like what it is for a bowl of reaction. Rest what is for half. So we take this 0.5 moles. We multiplied by the 111.8 joules per mole. Kelvin, we're going to find that you know, the most units cancel out. We're getting that. The change in entropy is going to be 55 0.9 jewels for held in, Um and that's gonna your final answer.

Here, We're going to calculate the normal boiling point of ethanol when thinking about the boiling point. We have a couple different components. We have our free energy at our boiling point. Our standard free energy we have our entropy standard are boiling point and we have our entropy at our boiling point At phase changes the standard free energy, The standard change and free energy will always be zero at a phase change. So at a boiling point, we're out of phase change. So we know that our standard free energy at the boiling point is going to be zero killed. Jewels This will become very important later were given that our standard entropy of vaporization is 110 Jules per more Calvin and that are in therapy of vaporization is 338.6. Killer Joel's purple. So now that we have these three values, we can use our equation here where we have our delta G standard is equal to adults h standard minus t delta s standard. So since we're solving for are boiling point, we will be solving for temperature. So let's go ahead and do some algebra here. We have that are Delta G standard minus adult h standard divided by T is equal Thio Excuse me. Divided by our standard entropy is going to be equal to cheat to negative teeth. Let's go ahead and change the signs we have that Delta H minus Delta G over dealt us is going to be equal to t. Let's go ahead and plug in some numbers. Here we have that our entropy is equal to 38.6 killed goals per mole and recall that are free energy change at any face change at a boiling point, a melting point is going to be zero. So this term is zero and we're going to divide that by our entropy, which is going to be 0.110 Kill a jewels. Permal Common Quick Unit check here We both have killed jewels and moles and we have 1/1 over Kelvin, which will give us Kelvin in the end. So we get that our temperature of boiling will be 350 0.9 kelvin. So are boiling. Point for ethanol is 350.9 color

When you're asked, given the heat of vaporization of a substance and its normal boiling point. What the vapor pressure is at a certain temperature. We know that the vapor pressure at the normal boiling point is going to be atmospheric pressure, which is 7 60 So I can go ahead and put 7 60 atma as my deeper pressure and temperature one and I could put my normal boiling point in as temperature one. And then what we're going to do is plug in the vapor pressure for temperature to as 15 degrees Celsius, which we will convert into, um, sorry, 15 degrees Celsius for my temperature, to which we will convert into Kelvin's, and then this vapor pressure a temperature to will be my ax. When I plug in those numbers, I wind up getting 41.60 tour as the vapor pressure at that second temperature

He wanted to calculate the river pressure and the temperature. 15. Solicitous Ever give all Zen temperature and the boiling point that Richard and the bowling wound We suppose it is T. Wan, which is equal. 78. Boeing for Seles Ia's so usually afraid to 73 Toby its value by the Culver. Usually the pressure and the boiling a bundt, which we call the B want, is 76 0 tour. So it's usually 760. No, that embrace your news that we want to calculate. The river pressure net is 15 seizures, which usually we had toe 8273 toe be its value boy Kelvin. He wanted to calculate the vapor pressure now, knowing that the unit also will be tour and give us a Delta H of globalization, which is equal 30 new negative 38.56 kills your beer and the value off idea gas. So no, no, I get there year and a value off are we will use, which is a 0.314 times Feinting bore negative. Three Toby. The same unit as Delta H. Q. Jules There a moon times one killed. So now from all these barometers that we have always given we can stop in thes Lola and B to divine by the one is equal negative Delta H of opposition divided by the ideal gas. Constant times by one divided by t to negative one. Divided by t Want that all barometer or exists the Beetle, which is unknown. That'd be one. We suppose it's 760 that built the interval Precision East 38156 The R is 8.3 14 times Vine Tim Bauer Negative three That Tito. We suppose it it 15 plus 273 And that t one is 78 on four plus 2/7 Street. So all perimeter are giving except is a veto. So by using musical please So we can calculated the pressure at 15 sleaziest, which we found its equal 40 warm or in seven tour. Thank you


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