A mixture of two moles of carbon monoxide and one mole of oxygen, in a closed vessel is ignited to convert the carbon monoxide to carbon dioxide. If `Delta H` is the enthalpy change and `Delta U` is the change in internal energy, then

Options

A. `Delta H lt Delta U`
B. `Delta H gt Delta U`
C. `Delta H =Delta U`
D. The relationship depends on the capacity of the vessel

Answer

A

Explanation

`2CO_((g)) +O_(2(g)) rarr 2CO_(2(g))`
`Delta n = 2-3=1. Delta n lt 0, Delta H = Delta U + Delta nRT, Delta H lt Delta U`