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Byju's Answer

Standard XII

Chemistry

Hess' Law

On combustion...

Question

On combustion carbon forms two oxides $C O$ and ${C O}_{2}$ , heat of formation of ${C O}_{2}$ is $- 94.3 k c a l$ and that of $C O$ is $- 26.0 k c a l$ . Heat of combustion of carbon is:

- 26.0 k c a l

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- 68.3 k c a l

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- 94.3 k c a l

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- 120.3 k c a l

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Solution

The correct option is D $- 94.3 k c a l$

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Similar questions

Q. Assertion :

C + \frac{1}{2} O_{2} ⟶ C O; Δ H = - 26.0 k c a l

C O_{2} + \frac{1}{2} O_{2} ⟶ C O_{2}; Δ H = - 68.3 k c a l

C + O_{2} ⟶ C O_{2}; Δ H = - 94.3 k c a l

Reason: This is an experimental proof of Hess's law.

Read the above assertion and reason and choose teh correct option regarding it.

Q. The heat of carbon combustion with the

{C O}_{2}

formation, is

- 393.5 K J / m o l

, and the heat of

C O

combustion with the formation of

{C O}_{2}

, is

- 283 K J / m o l

. calculate the heat of combustion of carbon there in

C O

Enthalpy of combustion of carbon to CO₂ is –393.5 kJ mol^–1. Calculate the heat released upon formation of 35.2 g of CO₂ from carbon and dioxygen gas.

Q. The heat of formation of

C O

and

C O_{2}

are

- 26.4

kcal and

- 94

kcal respectively. The heat of combustion of carbon monoxide will be:

Q. The heat of combustion of carbon to

C O_{2}

is -393.5 kJ/mol. The heat released upon formation of 35.2g of

C O_{2}

from carbon and oxygen gas is

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On combustion carbon forms two oxides CO and CO2, heat of formation of CO2 is −94.3 kcal and that of CO is −26.0 kcal. Heat of combustion of carbon is:

The correct option is D −94.3 kcal

On combustion carbon forms two oxides $C O$ and ${C O}_{2}$ , heat of formation of ${C O}_{2}$ is $- 94.3 k c a l$ and that of $C O$ is $- 26.0 k c a l$ . Heat of combustion of carbon is:

The correct option is D $- 94.3 k c a l$