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How much energy is released when 6 mole ...

How much energy is released when 6 mole of octane is burnt in air ? Given `DeltaH_(f)^(@)` for `CO_(2)(g),H_(2)O(g)` and `C_(8)H_(18)(l)` respectively are `-490,-240` and `+160KJ//mol`

A

`-6.2 MJ`

B

`-37.4 MJ`

C

`-35.5 MJ`

D

`-20.0 MJ`

Text Solution

Verified by Experts

The correct Answer is:
B
`C_(8)H_(18)+(15)/(2)O_(2)to8CO_(2)9H_(2)O`
`DeltaH=8xxDeltaH_(f)CO_(2)+9xxDeltaH_(f)H_(2)O-DeltaH_(f)C_(8)H_(18)`
`=8xx(-490)+9xx(-240)-(160)`
`=-3920-2160-160=-6240 kJ`
Heat produced on burning `6` moles of octane
`=-6240 kJxx6=-37440 kJ=-37.440 MJ`
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DINESH PUBLICATION-CHEMICAL THERMODYNAMICS AND CHEMICAL ENERGETICS -Exercise
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  4. For the equilibrium H(2) O (1) hArr H(2) O (g) at 1 atm 298 K

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  6. In a reversible process, Delta S(sys) + Delta S(surr) is

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  7. For the reaction N(2)+3H(2)hArr2NH(3), DeltaH=?

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  8. One mole of a perfect gas expands isothermally to ten times its origin...

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  9. An ideal gas expands from 1xx10^(-3)m^(3) to 1xx10^(-2)m^(3) at 300K a...

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  10. The enthalpies of combustion of carbon and carbon monoxide are -393.5 ...

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  11. One mole of an ideal gas is expanded freely and isothermally at 300 K ...

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  12. A cylinder of gas supplied by Bharat Petroleum is assumed to contain 1...

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  13. The value of Delta H and Delta S for five different reaction are given...

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  15. DeltaH and DeltaS for a reaction are +30.558 kJ mol^(-1) and 0.66 kJ m...

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  16. What would be the heat released when an aqueous solution containing 0....

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  17. A reaction occurs spontaneously if:

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  18. The absolute enthalpy of neutralization of the reaction, MgO(s)+2HCl...

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  19. For a spontaneous reaction, DeltaG, equilibrium constant (K) and E(cel...

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  20. Consider the reaction: N(2) + 3H(2) hArr 2NH(3) carried out at constan...

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