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The heat of combustion of ethanol determ...

The heat of combustion of ethanol determined in a bomb calorimeter is `-670.48" Kcal mole"^(-1)" at "25^(@)C.` What is `triangleH" at "25^@C` for the combustion reaction?

A

`-335.24` K. Cals.

B

`-671.08` K. Cals.

C

`-670.48` K. Cals.

D

`+670.48` K. Cals.

Text Solution

Verified by Experts

The correct Answer is:
B
`C_(2)H_(5)OH_((l))+3O_(2(g))rarr 2CO_(2(g))+3H_(2)O_((l))`
In Bomb calorimeter `Delta E = 670.48 kCal mol^(-1)`
`Delta H=Delta E + Delta n_(g)RT`
`Delta H=-670.48-1xx2xx10^(-3)xx298`
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ALLEN-THERMODYNAMICS -EXERCISE -2
  1. Which is true for the combustion of sucrose (C(12)H(22)O(11)) at 25^(@...

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  2. Identify the reaction for which Delta H != Delta E

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  3. The heat of combustion of ethanol determined in a bomb calorimeter is ...

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  4. The difference in Delta H and Delta E for the combustion of methane at...

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  5. Which of the following reactions is Delta H less than Delta E ?

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  6. For a reaction 2X(s)+2Y(s)rarr 2Cl(l)+D(g) The q(p) at 27^(@)C is -...

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  7. The work done in ergs for the reversible expansion of one mole of an i...

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  8. Two liters of N(2) at 0^(@)C and 5 atm pressure is expanded isothermal...

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  9. Two moles of an ideal gas expand spontaneously into a vacuum. The work...

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  10. One mole of a gas occupying 3dm^(3) expands against a constant externa...

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  11. For which reaction from the following, DeltaS will be maximum?

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  12. An adiabatic process is one in which :-

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  13. Entropy means

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  14. Delta S for the reaction : MgCO(3) rightarrow MgO(s) + CO(2)(g)

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  15. Change in entropy is negative for

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  16. In which reaction Delta S is positive :-

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  17. When the egg is hard boiled, there

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  18. If S^@" for "H(2), Cl2 and HCl are 0.13, 0.22 and 0.19" kJ K"^(-1)"mol...

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  19. Which has the least entropy :

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  20. When two gases are mixed the entropy :-

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