1.

For the reaction 2NO_(2)rarrN_(2)O_(3)+O_(2), rate expression is as follows : -(d[NO_(2)])/(dt)=K[NO_(2)]^(n), where K=3xx10^(-3)mol^(-1)L sec^(-1) If rate of formation of oxygen is 1.5xx10^(-4)mol L^(-1)sec^(-1) then the molar concentration of NO_(2)in mole L^(-1) is :

Answer»

`1.5xx10^(-4)`
`0.0151`
`0.214`
`0.316`

Solution :From the UNIT of k, it is evident that it is second ORDER reaction.
`-(1)/(2)=(d[NO_(2)])/(dt)=(d[O_(2)])/(dt)`
`:.""-(d[NO_(2)])/(dt)=2XX(d[O_(2)])/(dt)=2xx1.5xx10^(-4)=3XX10^(-4)`
`3xx10^(-4)=K[NO_(2)]^(2)=3xx10^(-3)[NO_(2)]^(2)`
`:. ""[NO_(2)]=0.316`


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