1.

In the first order thermal decomposition of C_2H_5I(g) to C_2H_4 (g) + HI(g), the reactant in the beginning exerts a pressure of 2 bar in a closed vessel at 600 K. IF the partial pressure of the reactant is 0.1 bar after 100 minutes at the same temperature the rate constant in min^-1 is (log 2=0.3010)

Answer»

`6.0 TIMES 10^-4`
`6.0 times 10^-3`
`3.0 times 10^-3`
`3.0 times 10^-4`

Solution :`C_2H_2I to C_2H_4(g)+HI(g)`
at t=0 2BAR 0 0
After 1000 MINUTES `0.1 (2-0.1) (2-0.1)
=1.9 =1.9
Since, the reaction in first order.
`k=2.303/t log""p/(p_0-x)`
`k=2.303/1000 log""2/(2-1.9)`
`=2.303/1000log 20`
`k=3 times 10^-3 min^-1`


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