The initial concentration of a reactant in a first order reaction is 0.860 M. What will be its concentration after 1 half-lives have passed?

The activation energy, Ea, for a particular reaction is 19.4 kJ/mol. If the rate constant at 80 C is 0.820 Ms, then what is the value of the rate constant at 273 C? (R = 8.314 J/mol K)

The activation energy, Ea, for a particular reaction is 13.6 kJ/mol. If the rate constant at 754 C is 24.5/min, at what temperature (in C) will the rate constant be 16.3/min? (R = 8.314 J/mol K)

The activation energy Ea for a particular reaction is 42.2 kJ/mol. How much faster is the reaction at 343 K than at 324 K? (R = 8.314 J/mol K)