The gas phase decomposition of hydrogen iodide at 700 K HI(g)½ H2(g) + ½ I2(g) is second order in HI with a rate constant of 1.20×10-3 M-1 s-1. If the initial concentration of HI is 0.397 M, the concentration of HI will be 4.64×10-2 M after ______ seconds have passed.
(a) The gas phase decomposition of hydrogen iodide at 700 K
HI(g)½ H2(g) + ½ I2(g)
is second order in HI with a rate constant of 1.20×10-3 M-1 s-1.
If the initial concentration of HI is 0.397 M, the concentration of HI will be 4.64×10-2 M after ______ seconds have passed.
(b) In a study of the rearrangement of ammonium cyanate to urea in aqueous solution at 50 °C
NH4NCO(aq)(NH2)2CO(aq)
the concentration of NH4NCO was followed as a function of time.
It was found that a graph of 1/[NH4NCO] versus time in minutes gave a straight line with a slope of 1.67×10-2 M-1 min-1 and a y-intercept of 1.07 M-1.
Based on this plot, the reaction is______ order in NH4NCO and the rate constant for the reaction is ______ M-1 min-1.
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