avogadros law relates the volume of a gas to the number of moles of gas when temperatures and pressure are constant. according to the law, how many moles gaseous reactants if the volume if the volume of the gases is doubled

moles gaseous reactants will be doubled

Explanation:

Avogadro's law about ideal gas can be presented as PV=nRT where P is pressure, V is volume, n is the number of molecules, R is constant, and T is temperature.

The question asks how many molecules of gas reactant (n) so we can tweak the formula into n = ...

PV=nRT

n=PV/RT

Pressure, constant and temperature are the same so we can remove it from the equation.

n = V

The volume is directly proportional to the number of molecules. If the volume is doubled then (V2 = 2*V1), then the number of the molecule (n) needed will be doubled too.