The rate constant of a second-order reaction is 3.86 x 10−2 M-1 s-1. If the concentration of reactant A is 0.160 M after 75.6 sec, what was the initial concentration, [A]o? (Assume the reaction is A → B + C)

Aroom with dimensions 7.00m×8.00m×2.50m is to be filled with pure oxygen at 22.0∘c and 1.00 atm. the molar mass of oxygen is 32.0 g/mol. how many moles noxygen of oxygen are required to fill the room? what is the mass moxygen of this oxygen?

Given the following equation: 2a1 + 3mgcl2 --> 2alcl3 + 3mg how many moles of aluminum chloride are produced from 2.5 moles of magnesium chloride?

Iwould appreciate if someone could me.