Home
Class 12
CHEMISTRY
On combustion carbon forms two oxides CO...

On combustion carbon forms two oxides CO and `CO_(2)`. Heat of formation of `CO_(2)` is -393.5kJ and that of CO is -110.5kJ. Heat of combustion of CO is

A

`-393.5kJ`

B

`-504.0kJ`

C

`-283.0kJ`

D

283.0kJ

Text Solution

Verified by Experts

The correct Answer is:
C
(i) `C + (1)/(2)O_(2)(g) rarr CO, Delta H = - 110.5 kJ`
(ii) `C + O_(2)(g) rarr CO_(2), Delta H = - 393.5 kJ`
Subtract eq. (i) from eq. (ii),
`CO + (1)/(2)O_(2) rarr CO_(2), Delta H = - 283.0 kJ`
Promotional Banner

Topper's Solved these Questions

  • THERMODYNAMICS

    MODERN PUBLICATION|Exercise Multiple Choice Questions (Level-II)|85 Videos

  • THERMODYNAMICS

    MODERN PUBLICATION|Exercise Multiple Choice Questions (Level-III)|10 Videos

  • THE SOLID STATE

    MODERN PUBLICATION|Exercise RECENT EXAMINATION QUESTIONS|11 Videos

  • UNIT TEST - 3

    MODERN PUBLICATION|Exercise MULTIPLE CHOICE QUESTIONS|59 Videos

Similar Questions

Explore conceptually related problems

Magnesium burns in CO_(2) to form

Standard molar enthalpy of formation of CO_(2) is equal to

From the data given below at 298 K for the reaction : CH_(4)(g) + 2O_(2)(g) rarr CO_(2)(g) + 2H_(2)O(l) Calculate the enthalpy of formation of CH_(4)(g) at 298 K. Enthalpy of reaction is = -893.5 kJ Enthalpy of formation of CO_(2)(g) = 393. kJ mol^(-1) Enthalpy of formation of H_(2)O(l) = 286.0 kJ mol^(-1) .

The enthalpy of combustion of carbon to CO_(2)(g) is -393.5 kJ mol^(-1) . The heat released upon the formation of 35.2 g of CO_(2) from carbon and dioxygen is :

The ratio of heats liberated at 298 K from the combustion of one kg of coke and by burning water gas obtained from kg of coke is (Assume coke to be 100% carbon). (Given enthalpies of combustion of CO_2 , CO and H_2 as 393.5 kJ, 285 kJ, 285 kJ respectively at 298 K).

The oxidation state of iron in Fe(CO)_(5) is :