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### Under constant-volume conditions, the heat of com…

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Manhattan College

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Problem 58

A 1.800 -g sample of phenol $\left(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{OH}\right)$ was burned in a bomb calorimeter whose total heat capacity is 11.66 $\mathrm{kJ} /^{\circ} \mathrm{C}$ The temperature of the calorimeter plus contents increased from 21.36 to $26.37^{\circ} \mathrm{C}$ (a) Write a balanced chemical equation for the bomb calorimeter reaction. (b) What is the heat of combustion per gram of phenol? Per mole of phenol?

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## Video Transcript

This is probably number fifty eight eight of Chapter five and chemistry is central science. So a important gram sample Athena was burned in a bum comic writer whose capacity is one point six six killed. Jules Persia, Greece. Enemy air temperature of the calorie under its contents increased from twenty one point six to twenty six. Thirty seven point three seven degree Celsius. They wanted right a balanced chemical question for the bomb calorie meter. So in this Casey, six are final. Is going to react with oxygen to produce your tune. Who and water give some more space because we have to put in coefficients. So that's it. It's on the left, six on the right. Great. So we have two on the right and we have six on six occasions on the left. Now we have twelve and fifteen on the right and then three on the left. So let's put this aside that we have had fourteen but seven front of here and that we have bounce our equation. There are fifteen on the left and fifteen on the right. Now they want us to never part B. They want to know the amount of heat the heat of combustion per gram of fino and I was a perma Latino. So first we find the heat of compassion. So we're going to multiply that He crossed the color under times Delta T eleven, twenty six, six times twenty six point three, seven hundred twenty one point three six six. So the amount of heat so the heat of compassion is going to be fifty eight a point four or kill it, Jules. And now program of sample going tohave fifteen goingto have fifty eight point four are over one point eight, mate. And that's going to equal thirty two point four killing girls. Program him. And now we have to look at it. Permal. So we have to convert this to moles. So one point eight grams OK, what's gonna be? They're six servants of twelve times six. They're six six, hundreds of plus ethics. That and then option. And our sixteenth, That's ninety four Grants parole zero one. Nice. Fine bones. So fifty eight point four kilograms. It's like killing Jules over zero point zero one nine more is going to equal three. Eight thousand seven hundred. Three thousand seventy three point seven. Kill it Jules hurt more. And these are our two answers. Three thousand seventy three point seven killed just promote and thirty three point four killer Jules program.