If you produce 35.7 grams of sodium chloride how many molecules of Chlorine gas were needed?
2Na + Cl2 --> 2NaCl
(PLS HELP)

number of molecules of chlorine gas are needed.

Explanation:

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.

what is the volume occupied by 40 grams of argon gas (ar) at standard conditions? what volume, in liters, is occupied by 1.5 x 1023 

"the periodic table is arranged in order of atomic number."