15. The activation energy Ea is 139.7 kJ mol−1 for the gas phase reaction HI+CH3I ----> CH4 + I2 Calculate the fraction of the molecules whose collisions would be energetic enough to react at (a) 100. °C (b) 200. °C. (c) 500. °C (d) 1000. °C

1. The following data was obtained from decomposition of nitrogen oxide (NO). 2HX H2 + X2 T(K) 703 733 759 791 811 836 865 k (L mol-¹s-¹) Find; 0.011 0.035 0.105 0.343 0.790 2.14 4.95 (a) The activation energy, Ea. (b) The Arrhenius constant, A (c) The collision frequency, ZAA (d) The following mechanism was suggested for the reaction. Is the mechanism meet with the order of reaction? X₂ = X + X X + H2 H + XH + HX2 X + H₂ Fast Slow Fast

1)The reaction A -> product is second order. If the initial concentration of A is 0.436 M and, after 52.8 seconds have elapsed, the concentration of A has fallen to 0.0476 M, what is the rate constant of the reaction?     2) consider the following reaction at equilibrium.2CO2 (g) ->_<-- 2CO (g) + O2 (g)  H° = -514 kJLe Châtelier's principle predicts that the equilibrium partial pressure of CO (g) can be maximized by carrying out the reaction ________.