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The ratio of heats liberated at 298K fro...

The ratio of heats liberated at 298K from the combustion of one kg of coke and byburning water gas obtained from 1kg of coke Is (Assume coke to be `100%` carbon). (Given : enthalpies of combustion of `CO_2, CO` and `H_2` are 393.5 kJ, 285 kJ, 285 kJ respectively all at 298K)

A

0.79:1

B

0.69:1

C

0.80:1

D

0.96:1

Text Solution

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The correct Answer is:
B
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Find out the heat of formation of CH_(3)CO OH . Given that the heat of Combustion of CH_(3)CO OH is -867 " kJ mol"^(-1) and the heat of formation of CO_(2) and H_(2)O are -393.5 and -285.9 " kJ mol"^(-1) respectively.

Find out the heat of formation of CH_3COOH . Given that the heat of combusion of CH_3COOH is -867 KJ mol^-1 and the heat of formation of CO_2 and H_2O are - 393.5 and - 285.9 KJ mol^-1 respectively.

Knowledge Check

  • When 3g of ethane gas is brunt at 25^(@)C , 156 kJ of heat is liberated. If the standard enthalpies of formation for CO_(2)(g) and H_(2)O(l) are -393.5 and -285.8 kJ*mol^(-1) respectively, then for ethane gas-

    A
    standard heat of combustion`=-1560kJ*mol^(-1)`
    B
    standard heat of formation`=-67.9kJ*mol^(-1)`
    C
    standard heat of combustion=-832`kJ*mol^(-1)`
    D
    standard heat of formation =-84.4`kJ*mol^(-1)`.

  • Heat of combustion of carbon to CO_(2) is -393.5 kJ/mol. The heat released upon the formation of 35.2 kg of CO_(2) from carbon and oxygen gas is-

    A
    `-315kJ`
    B
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    C
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    D
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  • The enthalpies of formation of C_2H_2(g) and C_6H_6(g) at 298 K are 230 and 85 kJ/mol respectively. The enthalpy change for the reaction 3C_2H_2(g) to C_6H_6(g) is

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    605 kJ/mol
    B
    865 kJ/mol
    C
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    -865 kJ/mol

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