Question

I have no Idea how to do these. there is a previous question that you have to find the K value which I got. and that's .0042M/s. Am I using the wrong K value? The answers are provided, please help me out thank!

Answer 1

According to the unis, the reaction is zero order. Thus, the rate constant for zero order reaction: Initial concentration of NH,, [NH0.80 M Final concentration of NH NH,1-? 60 s Time, t- 3 minx_ t-3 min x min - 180 s Therefore -0.800 M-0.0042-x 180 s -0.800 M-0.756 M - 0.800 M- 0.756 M 0.044 M Hence, the concentration of NH, after 3 min is 0.044 M Initial concentration of NH3, [NH30-? Final concentration of NH,, [NH0.005 M Time, t 10 minx- 60 s min = 600 s The reaction is zero order. Therefore 0.005 M-NH,,-0.0042-x 600 s Hence, the initial concentration of NH, is2.5 M