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Question: The heat of combustion of ethane and benzene is – 1560 and – 3268 kJ \(mol^{- 1}\) respectively. whi...

The heat of combustion of ethane and benzene is – 1560 and – 3268 kJ mol−1mol^{- 1} respectively. which of two has higher efficiency as fuel per gram and the amount of heat produced per gram?

A

Benzene, 41.9kJg−141.9kJg^{- 1}

B

Ethane, 52kJg−152kJg^{- 1}

C

Benzene, 78kJg−178kJg^{- 1}

D

Ethane, 30kJg−130kJg^{- 1}

Answer

Ethane, 52kJg−152kJg^{- 1}

Explanation

Solution

: Heat produced by ethane,156030=52kJg−1\frac{1560}{30} = 52kJg^{- 1}

Heat produced by benzene,326878=41.9kJg−1\frac{3268}{78} = 41.9kJg^{- 1}