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At what standard conditions does the heat of combustion calculated?

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At what standard conditions does the heat of combustion calculated?

(a) 26°C, 1 atm

(b) 25°C, 0.5 atm

(c) 25°C, 1 atm

(d) 26°C, 0.5 atm

The question was asked in class test.

I'm obligated to ask this question of Enthalpy Change Due to Reaction topic in section Energy Balance of Bioprocess Engineering

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Right option is (c) 25°C, 1 atm

Explanation: The standard heat of combustion Δh°c is the specific enthalpy change associated with this reaction at standard conditions, usually 25°C and 1 atm pressure. The standard heat of reaction is the difference between the heats of combustion of reactants and products.

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