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Determine the normal boiling point (in kelvin) of dichloroethane, $\mathrm{CH}_{2} \mathrm{Cl}_{2}$ . Find the actual boiling poiling point using the Internet or some other source, and calculate the percent error in the temperature. Explain the differences, if any, between the two values.

The boiling point of dichloromethane is 311.7 $\mathrm{K}$ . The boiling point that canbe found on the internet is 312.75 $\mathrm{K}$ . Percentage of error is $-0.33 \%$

Chemistry 102

Chapter 16

Thermodynamics

Rice University

University of Kentucky

Brown University

Lectures

00:42

In thermodynamics, the zer…

01:47

A spontaneous process is o…

00:39

Consult Figures $10.26,10.…

01:05

Use the normal boiling poi…

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What is the normal boiling…

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Define the terms boiling p…

02:43

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The boiling point of liqui…

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02:56

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00:51

The boiling point of the e…

08:28

for this question were asked to find the boiling point and the percent error off the transition of C H to seal to from a liquid to a gas. So let's look at first the equation that we want to use. So that's going to be Delta G Standard is equal to Delta H Standard minus t don't s standard. So one critical thing we need to know is that because it's a change in the state of matter, we actually know that Delta G Standard is going to be equal to zero. Thus making this formula zero equals Delta H standard minus t Delta s standard. And then we can change it into t equals still to age standard over Delta s standards. So that's what we'll eventually find is that temperature at which this reaction happens, where it goes from a liquid to a gas. So here are just some values that I got from Appendix G and laid them out in the chart. I got thes until P values and I got also lots of entropy values. If we want to find the, um, what's chart my finding the Delta H standard for the reaction again? This is gonna be the summation of the products minus the reactant. So in this case, we're going to get to eight 800 drools per well, we want this in jewels because overhearing and trip, you were gonna get them jewels. So we're just taking a preemptive step right here. Um, next, if we use these standard values, we're going to get again. Same thing. Summation of the products minus reactors. We're gonna get the Delta s standard for the reaction equal to 92.4 jewels per counting Permal. So now we can actually go ahead and solve for t. Remember, God wishes dealt a h over adult us. We're gonna put 28800 over 92.4 and we're gonna get a temperature of 311.68 He almost ran out of the space there and remake help it. So when we look it up, we have. So let's just go back and show that our, um, experimental value of the value me just found from calculations is going to be 3 11.688 And when we look at what we can find that the actual boiling point is going to be 312.75 helping. So we were pretty close, but we actually want to help you. The percent errands were going to use this formula where we take the difference of these two values, the actual minus the experimental divided by the experimental value and then multiplied by 100. So the difference is going to be 1.75 and then we're gonna put that over 3 11 and we're going to get a present era of 110.34%.

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