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Burning And Combustion

The correct e...

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The correct expression for enthalpy of combustion is

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Q. Change in enthalpy

(Δ H)

for combustion of fuel is:

Q. The enthalpy change for the reaction

C_{3} H_{8} (g) + H_{2} (g) \to C_{2} H_{6} (g) + C H_{4} (g)

25^{o}

is -55.7 kJ / mol . Calculate the enthalpy of combustion of

C_{2} H_{6} (g)

. The enthalpy of combustion of propane is

- 2220 k J m o l^{- 1}

and enthalpy of

H_{2}

C H_{4}

are -285.8 KJ/mol and -890 KJ/mol respectively.

Q. Enthalpy of the reaction :

C H_{4} + \frac{1}{2} O_{2} ⟶ C H_{3} O H

is negative. If enthalpy of combustion of

C H_{4}

C H_{3} O H

x

y

respectively, which relation is correct?

C H_{4} + \frac{1}{2} O_{2} \to C H_{3} O H

is negative. If enthalpy of combustion of

C H_{4}

C H_{3} O H

are x and y respectively then which relation is correct ?

Q. If the enthalpy of combustion of diamond and graphite are

- 395.4 k J m o l^{- 1}

- 393.6 k J m o l^{- 1}

,
The enthalpy change for the

C (g r a p h i t e) ⟶ C (d i a m o n d)

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