4. Erthylene oxide decomposes at elevated temperatires according to the equation: (CH2)2O(g)CH4(g)+CO(g) This reaction obeys first-order kinetiea. After 16 minutes at 688K, a meamurement shows that the concentration of (CH2)hO (ethylene oxide) has decreased from 0.800 mol/L to 0.600 mol/L. Caleulate the half-life (tin) in seconds at 688K. a. 960= b. 1657s c. 2310I d. 3104s c. 30205 5. The reaction, 2A(oaj)2B(na)+C(x)+D(x) is suspected to be first order in A. Which of the following kinetic plots would be the most useful to confirm the order of the reaction? a. A plot of [A]2 vs.t b. A plot of ln[A]1 vs. 1 c. A plot of [A] vs. t d. A.plot of In [A] vs. t c. A plot of [A]1 vs. 6. The acid dissociation constant of an unknown acid is 4.1101. What is Kb for the conjugate base? a. 5.5105 b. 1.5109 ie sitisinionil if 9104 6.87102