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The standard molar heat of formation of ...

The standard molar heat of formation of 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

Text Solution

Verified by Experts

The correct Answer is:
A
`C_(2)H_(6)+(7)/(2)O_(2)rarr2CO_(2)+3H_(2)O` substitute the values.
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The standard molar heats of formation of ethane, carbon dioxide, and liquid water ate -21.1, -94.1 , and -68.3kcal , respectively. Calculate the standard molar heat of combustion of ethane.