Question

2 Na + Cl2 → 2 NaCl

How many grams of Cl2 are needed to completely react with 46.5 grams of Na?
g of Cl2

Answer 1

Approximately 71.77 grams. I think so

Answer 2

Grams of Cl₂ needed : 71.781 g

Further explanation

Reaction

2 Na + Cl₂ → 2 NaCl

mass of Na = 46.5 g

mol of Na(Ar=23 g/mol) :

`\tt mol=(mass)/(MW)\\\\mol=(46.5)/(23)=2.021`

From equation, mol ratio of Na : Cl₂ = 2 : 1, so mol Cl₂ :

`\tt (1)/(2)* 2.021=1.011`

Mass of Cl₂(MW=71 g/mol) :

`\tt mass=mol* MW\\\\mass=1.011* 71\\\\mass=71.781~g`