What is the molar heat of combustion for ethanol?

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Discussion Overview

The discussion revolves around calculating the molar heat of combustion for ethanol based on a specific mass and the heat released during combustion. The focus is primarily on the mathematical reasoning involved in determining the number of moles and the corresponding heat per mole.

Discussion Character

  • Homework-related
  • Mathematical reasoning

Main Points Raised

  • One participant presents a problem involving the combustion of 2.9g of ethanol, asking for assistance in calculating the molar heat of combustion.
  • Another participant suggests calculating the number of moles of ethanol in 2.9g.
  • A subsequent reply confirms the approach of dividing the mass of ethanol by its molar mass (46 g/mol) to find the number of moles.
  • Another participant notes that with 87 kJ released for the calculated moles, the next step is to determine the heat released per mole.

Areas of Agreement / Disagreement

Participants generally agree on the method of calculating moles from mass and the subsequent steps to find the molar heat of combustion, but the discussion remains focused on the calculations without reaching a final answer.

Contextual Notes

The discussion does not specify any assumptions regarding the conditions of combustion or the accuracy of the molar mass used. There are also no resolved mathematical steps presented.

Who May Find This Useful

Students or individuals interested in thermochemistry, particularly those looking to understand calculations related to heat of combustion and stoichiometry.

bada man
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The question i am stuck on is "If 2.9g of ethanol burn with the evolution of 87 kj of heat, what is the molar heat of combustion of ethanol?" thank you for your help if it possible you can tell me how to do this question.
 
Chemistry news on Phys.org
2.9g ethanol - how many moles?
 
so basically so find how many moles of ethanol in 2.9g

So u do, 2.9g/46 (46 being the molar mass of ethanol)
 
87 kJ for 2.9/46 moles, how much for 1 mole?
 

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