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The heats of formation of CH(4)(g),C(2)H...

The heats of formation of `CH_(4)(g),C_(2)H_(6)(g) and C_(4)H_(10)(g)` are `-74.8, -84.7 and -126.1 kJ" "mol^(-1)` respectively. Arrange them in order of their efficiency as fuel per gram. Heats of formation of `CO_(2)(g) and H_(2)O(l)` are `-393.5` and `-285.8`kJ `mol^(-1)` respectively.

Text Solution

Verified by Experts

The correct Answer is:
`CH_(4) gt C_(2)H_(6) gt C_(4)H_(10)`
First determine heat of combustion in each case and then find the calorific value.
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OP TANDON-Chemical Thermodynamics and Thermochemistry-Practice problems
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  2. The heat of combustion of butane is 2880kJ" "mol^(-1). What is the hea...

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  3. The heats of formation of CH(4)(g),C(2)H(6)(g) and C(4)H(10)(g) are -7...

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  4. The heat of combustion of carbon to CO(2)is-395.5kJ//mol.The heat rele...

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  5. Calculate DeltaH(f)^(@) of C(6)(s) from the following data:, DeltaH(...

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  6. Calculate the amount of heat released when: (i) 100 mL of 0.2 M HCl ...

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  7. When 100 mL each of HCl and NaOH solutions are mixed, 5.71 kJ of heat ...

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  8. Determine enthalpy change for, C(3)H(8(g))+H(2(g))rarr C(2)H(6(g))+C...

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  9. The standard ethelpy of combustion at 25^(@)C of hydrogen, cyclohexene...

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  10. From the following data of heats of combustion, find the heat of forma...

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  11. The heat of combustion of methane is -880 KJ mol^(-1). The quantity of...

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  12. Calculate the standard heat of formation of C(10)H(8) (naphthalene) if...

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  13. The heat of combustion of liquid ethanol is -327.0 kcal calculate the ...

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  14. Calculate heeat of formation of cane sugar following data: H(2)(g)+(...

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  15. The heats of formation of C(6)H(6)(l),H(2)O(l) and CO(2)(g) are 11.70,...

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  16. Calculate the heat of hydrogenation of C(2)H(2) to C(2)H(4). H(2)(g)...

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  17. Calculate the heat of hydrogenation , C(2)H(4)(g)+H(2)(g)toC(2)H(6)(...

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  18. The enthalpies of formation of Al(2)O(3) and Cr(2)O(3) are -1596KJ and...

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  19. Calculate DeltaH for the reaction H(2)(g)+1//2O(2)(g)toH(2)O(g) gi...

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  20. Using the bond enthalpy data, calculate DeltaH of the following reacti...

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