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1. Dinitrogen pentoxide (N2O5) decomposes to NO2 and O2 at relatively low temperatures in the reaction...

1. Dinitrogen pentoxide (N2O5) decomposes to NO2 and O2 at relatively low temperatures in the reaction 2N2O5(soln) → 4NO2(soln) + O2(g) This reaction is carried out in a CCl4 solution at 45° C. The concentrations of N2O5 as a function of time are listed in the table. Plot a graph of the concentration versus t, ln (natural log) concentration versus t, and 1/concentration versus t. Graphically, determine the order of the reaction, write the rate law and calculate the value of the rate constant. What is the half-life for this reaction (at the initial concentration)? How long will take for 90% of the initial concentration of N2O5 to be converted to products?

Time, s [N2O5],M

0, 0.0365

600, 0.0274

1200, 0.0206

1800, 0.0157

2400, 0.0117

3000, 0.00860

3600, 0.00640

2. 1, 3-Butadiene (CH2=CH-CH=CH2) is a volatile and reactive organic molecule used in the production of rubber. Above room temperature it reacts slowly to form products. Concentrations of 1,3-butadiene (C4H6) as a function of time at 326°C are listed in the table below. Graph the data as concentration versus t, ln (natural log) concentration versus t, and 1/concentration versus t. Graphically, determine the order of the reaction, write the rate law and calculate the value of the rate constant. What is the half-life for this reaction (at the initial concentration)? How long will take for 80% of the initial concentration of 1,3-Butadiene to be converted to products?

Time, s [C4H6],M

0, 1.72 X 10^2

900, 1.43 X 10^2

1800, 1.23 X 10^2

3600, 9.52 X 10^3

6000, 7.30 X 10^3

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