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  • Heat of combustion of Carbon monoxide at constant volume and at is <img alt="-28.3\, KJ" src="http://entranc

Heat of combustion of Carbon monoxide at constant volume and at 27^{o}C is -28.3\, KJ. The heat (in KJ) of combustion at constant pressure is

Option: 1

-30.8


Option: 2

-25.8


Option: 3

30.8


Option: 4

25.8


Answers (1)

best_answer

The heat of combustion at constant volume basically changes in internal energy \Delta E=-28.3\, K\! J

T = 273+27 = 300K

2CO+O_{2}\rightarrow 2CO_{2}

So, the net change in moles, \Delta n=2-3=-1

The heat of combustion at constant pressure is \Delta H

\Delta H=\Delta E+\Delta nRT

\\ \Delta H =-28.3\ kJ -1\times8.314\times300\ J \\ \Delta H = -28.3\ kJ -2.494\ kJ

\Delta H=-30.8 KJ

 

Posted by

Rishabh

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