The elementary liquid-phase series reaction k1 k2
A → B → C

is carried out in a 500 L batch reactor. The initial concentration of A is 1.6 mol/L. The desired product is B, and separation of the undesired product C is very costly. Because the reaction is carried out at a relatively high temperature, the reaction is easily quenched. Given

k1= 0.4h -1
k2= 0.01h- at 100°C

Required:
Assuming that each reaction is irreversible, plot the concentrations of A, B, and C as a function of time.

Modern pennies are composed of zinc coated with copper. a student determines the mass of a penny to be 2.482 g and then makes several scratches in the copper coaling (to expose the underlying zinc). the student puts the scratched penny in hydrochloric acid, where the following reaction occurs between the zinc and the hcl (the copper remains undissolved): zn(s) + 2 hcl(aq) → h2(g) + zncl(aq)the student collects the hydrogen produced over water at 25 °c. the collected gas occupies a volume of 0.899 l at a total pressure of 79 j mmhg. calculate the percent zinc (by mass) in the penny. (assume that all the zn in the penny dissolves.)