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Title: How do you calculate the molar heat of combustion of a substance? Post by: jbritlyn on Dec 12, 2014 I'm trying to understand how to calculate the molar heat of combustion of a substance, given the heat capacity of a calorimeter as well as the mass of water that the calorimeter contains.
I cannot find any such problems online, and my book is of very little help. Here is the example I am currently working on, and need help with: 10 g of methane (CH4) is combusted in a calorimeter that has an empty heat capacity of 18 J/°C. The calorimeter contained 150 g of water. If the temperature changed from 25.2 °C to 30.3 °C, calculate the molar heat of combustion of methane in J/mol. The answer is given to me, which is -5270 J/mol. However, I am completely lost as to how I would arrive at that answer. Please, please help! Title: Re: How do you calculate the molar heat of combustion of a substance? Post by: padre on Dec 12, 2014 Hope this helps:
Title: Re: How do you calculate the molar heat of combustion of a substance? Post by: wizarddim on Dec 12, 2014 [(4.18 J/gC) * 150 g H2O * 5.1 C] / (10 g CH4 / MW CH4 g/mole) =319.77
Title: Re: How do you calculate the molar heat of combustion of a substance? Post by: Amaya Kiyo on Nov 23, 2020 Thank you
Title: Re: How do you calculate the molar heat of combustion of a substance? Post by: fwordnword on Nov 15, 2021 ty
Title: Re: How do you calculate the molar heat of combustion of a substance? Post by: Jeryl Joseph on Nov 30, 2021 The pdf is just the questions again lmao
Title: Re: How do you calculate the molar heat of combustion of a substance? Post by: padre on Nov 30, 2021 The pdf is just the questions again lmao Answers are at the very end of the document :-\ |