The heat of combustion of ethyl alcohol is `-300 kcal.` If the heats of formation of `CO_(2)(g)` and `H_(2)O(l)` are`-9.3` and `-68.5 kcal` respective

Question

The heat of combustion of ethyl alcohol is `-300 kcal.` If the heats of formation of `CO_(2)(g)` and `H_(2)O(l)` are`-9.3` and `-68.5 kcal` respective

The heat of combustion of ethyl alcohol is `-300 kcal.` If the heats of formation of `CO_(2)(g)` and `H_(2)O(l)` are`-9.3` and `-68.5 kcal` respectively, calculate the heat of formation of ehtyl alcohol.

Monjur Alahi

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2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Salim Ahmed Kawsar

Correct Answer - `(-94.1 kcal)`
`C_(2)H_(6)O+3O_(2)(g)rarr2CO_(2)+3H_(2)O. " "DeltaH= -300 kcal`
`DeltaH_(comb)=2Delta H_(f,CO_(2))^(@)+3 DeltaH_(f,H_(2)O)^(@)-DeltaH_(f,C_(2)H_(6)O)`
`rArr DeltaH_(f,C_(2)H_(6)O)=2(-94.3)+3(-68.5)+300= -94.1 Kcal`

6 views Answered 2023-02-05 15:29