A second-order reaction starts with an initial concentration of 0.020 M of the reactant. If the rate constant is 1.0x10-3 M-1s-1, what is the time required for the concentration of the reactant to reach 0.010 M?

t = 50,000s

Explanation:

Reaction is second order.

Initial conc. [A]o = 0.020 M

Rate constant = 1.0x10-3 M-1s-1

Final conc. [A] = 0.010M

Time = ?

1 / [A] = kt + 1 / [A]o

Substituting the values;

1 / 0.010 = 1.0x10-3 * t + (1/0.020)

100 - 50 = 1.0x10-3 * t

t = 50 / (1.0x10-3)

t = 50,000s

a compound is a molecule made of atoms from different elements.

a. by the combination of an unlimited number of elements