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The standard enthalpy of formation of oc...

The standard enthalpy of formation of octane `(C_(8)H_(18))` is `-250kJ //mol`. Calculate the enthalpy of combustion of `C_(8)H_(18)`. The enthalpy of formation of `CO_(2)(g)` and `H_(2)O(l)` are `-394 kJ//mol` and `-286kJ//mol` respectively.

A

`- 5200` kJ/mol

B

`- 5726` kJ/mol

C

`- 5476` kJ/mol

D

`- 5310` kJ/mol

Text Solution

Verified by Experts

The correct Answer is:
C
`C_(8)H_(18)(g)+(25)/(2)O_(2)(g)rarr8CO_(2)(g)+9H_(2)O(l)`
`Delta_(r )H^(@)=8xx(-394)+9xx(-286)-(-250)`
`=-5476 " kJ"//"mol"`
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NARENDRA AWASTHI-THERMODYNAMICS-Exercise
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  2. Use the given standard enthalpies of formation (in kJ/mol) to determin...

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  3. The standard enthalpy of formation of octane (C(8)H(18)) is -250kJ //m...

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  4. Determine the enthalpy of formation of B(2)H(6)(g) in kJ/mol of the fo...

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  5. Consider the following reactions: C(s)+O(2)(g)toCO(2)(g)+x " kJ" C...

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  6. If Delta(f)H^(@)(C(2)H(4)) and Delta(f)H^(@)(C(2)H(6)) are x(1) and x(...

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  9. The fat, C(57)H(104)O(6)(s), is metabolized via the following reaction...

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  10. The heat of formation of NH(3)(g) is -46 " kJ mol"^(-1). The DeltaH (i...

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  11. Consider the following reaction: H(2)O(l)toH(2)O(g)" "DeltaH(1)=44...

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  12. The standard enthalpy change for the following reaction is 436.4 kJ : ...

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  13. Determine enthalpy of formation for H(2)O(2)(l), using the listed enth...

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  14. Heat of combustion of ethanol at constant pressure and at temperature ...

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  17. What do you mean by para position ?

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  18. Write bond line formula for propane.

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  19. If the enthalpy of formation and enthalpy of solution of HCl (g) are-9...

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  20. At 25^(@)C, when 1 mole of MgSO(4) was dissolved in water, the heat ev...

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