<u>Answer:</u> number of molecules of chlorine gas are needed.
<u>Explanation:</u>
The number of moles is defined as the ratio of the mass of a substance to its molar mass. The equation used is:
......(1)
Given mass of sodium chloride = 35.7 g
Molar mass of sodium chloride = 58.44 g/mol
Plugging values in equation 1:
The given chemical equation follows:
By the stoichiometry of the reaction:
If 1 mole of sodium chloride is produced from 2 moles of chlorine gas
So, 0.611 moles of sodium chloride will be produced from = of chlorine gas
According to the mole concept:
1 mole of a compound contains number of molecules
So, 1.222 moles of chlorine gas will contain = number of molecules
Hence, number of molecules of chlorine gas is needed.