In a study of the gas phase decomposition of nitrogen dioxide at 383 °C
NO2(g)--->NO(g) + ½ O2(g)
the concentration of NO2 was followed as a function of time.
It was found that a graph of 1/[NO2] versus time in seconds gave a straight line with a slope of 0.761 M-1 s-1 and a y-intercept of 2.55 M-1.
Based on this plot, the reaction is _______(zero/first/second) order in NO2 and the rate constant for the reaction is _________M-1 s-1.
In a study of the gas phase decomposition of phosphine at 120 °C
PH3(g)---->1/4 P4(g) + 3/2 H2(g) the concentration of PH3 was followed as a function of time.
It was found that a graph of ln[PH3] versus time in seconds gave a straight line with a slope of -2.86×10-2 s-1 and a y-intercept of -2.35.
Based on this plot, the reaction is _______(zero/first/second) order in PH3 and the rate constant for the reaction is ____________ s-1.