Do we expect to see these kinds of calorimetry problems on the DAT?

[rak173]

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A compound is burned in a bomb calorimeter that contains 3.00 L of water. If the combustion of 0.285 moles of this compound causes the temp. of water to rise 36.0 degrees Celsius, what is the molar heat of combustion of the compound?

The formula you have to use is ΔH =mCΔT which is basically same as Q = mCΔT. How does this problem differ from finding heat transferred from a material (Q)? Do we expect to see these kind of problems on the DAT? I never saw this kind of question anywhere yet.

 

[HatInTheCat]

Yes. It's a thermodynamics-related question, so there's a chance you may see one. Watch Chad's Videos to get more practice.

 

[JLT223]

You better believe it. Know them well.

 

[Incis0r]

A compound is burned in a bomb calorimeter that contains 3.00 L of water. If the combustion of 0.285 moles of this compound causes the temp. of water to rise 36.0 degrees Celsius, what is the molar heat of combustion of the compound?

The formula you have to use is ΔH =mCΔT which is basically same as Q = mCΔT. How does this problem differ from finding heat transferred from a material (Q)? Do we expect to see these kind of problems on the DAT? I never saw this kind of question anywhere yet.

Just curious- what's the answer to this question?

 

[DAT Destroyer]

You better believe it. Know them well.

Agreed!

 

[rak173]

Yes. It's a thermodynamics-related question, so there's a chance you may see one. Watch Chad's Videos to get more practice.

I am asking this after watching Chad's video and doing his quizzes. These problems are done little differently than those "Calculate Heat transferred" problems.

 

[rak173]

Just curious- what's the answer to this question?

Answer is 1590 kJ/mol. I found these kinds of questions googling "Calorimetry worksheets". There are plenty of them online with answers.

 

[Incis0r]

Answer is 1590 kJ/mol. I found these kinds of questions googling "Calorimetry worksheets". There are plenty of them online with answers.

Thank you 🙂

 

[m91]

Answer is 1590 kJ/mol. I found these kinds of questions googling "Calorimetry worksheets". There are plenty of them online with answers.

Was wondering how you solved for this?

 

[rak173]

Was wondering how you solved for this?

Use ΔH =mCΔT to find out ΔH for water: ΔH =mCΔT = (3000 g)(4.184)(36) ≈ 452 kJ

So now we have 452 kJ for every 0.285 moles of the compound and so for every 1 mol we will have 452/0.285 ≈ 1590 kJ and this is the answer.