For a particular reaction (2R(g) ? P(s)) it was found that at one constant temperature, the pressure of R dropped 1.00 atm to 0.500 atm in 32.0 minutes.
a. If the reaction is zero order in R, how long will it take for 90% of the R to react?
b. If the reaction is first order in R, how long will it take for 90% of the R to react?
c. If the reaction is second order in R, how long will it take for 90% of the R to react?