(b-ǝb)ul 20 40 Pseudo-First Order Kinetics 60 80 Time (min) 100 y = -0.0232x+0:3842€ R²=0.903 120 140 160

4. How many collisions/sec will Ar gas have in a cubic container with walls lcm in length at 1 atm pressure and 298K. Assume there are no Ar-Ar collisions. 5. The human ear can detect pressures as low as 2 × 105 Nm-². Given an ear drum area of 1mm?, what is the minimum collision frequency (i.e. collision/sec) the ear can detect for N2 gas at 298K?

9. (a) What are the objectives of computational chemistry? Explain the differences intro between molecular mechanics and ab- initio methods.

the half-life of the first oder reaciton A to B is 5.0 min. How many minutes will it take to reduce the concentraction of A to 1/16 the initial value

A nuclcon is scattered elastically from a heavy nucleus. The effect of the heavy nucleus can be represented by a fixed potential -Vo r R, V (r) = where Vo is a positive constant. Calculate the deferential cross section to the lowest order in Vo.

The luminescent first-order decay of a certain organic molecule yields the following data t/s 2 3 4 10 I 100 60.65 36.79 22.31 13.53 8.21 0.67 where I is the relative intensity. Calculate the mean lifetime T for the process. 8.57 X S Is it fluorescence or phosphorescence? O fluorescence O phosphorescence

The equation of the tangent line to the graph of y = tan(4r) at z = VT is given by y= mI +b for and

d 7-6. Evaluate the commutator: [x, -ih]. dx

Given the following probability distribution for a discrete random variable X; X = x 1 4 P(X = x) 2k 3k 6k 9k a) Calculate the value of k. b) Find P(X 2 2.5) CS

Could you give me some explanation, the correct answer is at the bottom of the question.