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DeltaH for combustion of ethane and ethy...

`DeltaH` for combustion of ethane and ethyne are `-341.1` and `-310.0kcal` respectively. Which gas is better for welding purpose and why ?

Text Solution

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A better gas welder is one which possesses high calorific value `i.e.,` heat produced by `1 g` of fuel.
Calorific value for ethane `=(-341.1//30)`
`=-11.37kcal//g(mol. Wt. =30)`
Calorific value for ethyne`=(-310.0//26)` ltbr. `=-11.92kcal//g(mol. wt. =26)`
Thus ethyne is bettter gas welder.
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