The conversion of methyl isonitrile to acetonitrile in the gas phase at 250 Â°C CH3NC(g)CH3CN(g) is first order in CH3NC. During one experiment it was found that when the initial concentration of CH3NC was 6.20Ã10-2 M, the concentration of CH3NC dropped to 1.13Ã10-2 M after 433 s had passed. Based on this experiment, the rate constant for the reaction is s-1.

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The following data were collected for the conversion of methyl isonitrile to acetonitrile in the gas phase at 250 Â°C.

CH₃NC(g)--------->CH₃CN(g)

[CH₃NC], M	4.20Ã10^-2	2.10Ã10^-2	1.05Ã10^-2	5.25Ã10^-3
time, s	0	160.00	320.00	480.00

(a) What is the half-life for the reaction when [CH₃NC] = 4.20Ã10^-2 M?

_______s

(b) What is the half-life for the reaction when [CH₃NC] = 2.10Ã10^-2 M? ______s

(c) Is the reaction first order? yes or no?

If so, what is the rate constant for the reaction? (If not first order leave blank).__________________ s^-1