The standard molar heat of formation ethane, `CO_(2)` and water (l) are respectively -21.1, -94.1 and -68.3 kcal. The standard molar heat of combustio

Question

The standard molar heat of formation ethane, `CO_(2)` and water (l) are respectively -21.1, -94.1 and -68.3 kcal. The standard molar heat of combustio

The standard molar heat of formation ethane, `CO_(2)` and water (l) are respectively -21.1, -94.1 and -68.3 kcal. The standard molar heat of combustion of ethane will be
A. `-372 kcal`
B. 162 kcal
C. `240` kcal
D. 183.5 kcal

Monjur Alahi

4 views

2025-01-04 04:42

1 Answers

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

Correct Answer - A
Given,
(i) `2C+3H_(2)toC_(2)H_(6),DeltaH=-21.1` kcal
(ii) `C+O_(2) to CO_(2),DeltaH=-94.1kcal`
(iii) `H_(2)+(1)/(2)O_(2) to H_(2)O,DeltaH=-68.3kcal`
Multiplying Eq. (ii) by 2 and eq. (ii) by 3 then follow, 2(ii)+3
(iii)-(i)
`C_(2)H_(6)+(3)/(2)O_(2) to 2CO_(2)+3H_(2)O`
`Deltax=2(-94.1)+3(-68.3)-(-21.1)`
`=372` kcal