Calculate the volume and mass of chlorine consumed for the reaction with 23 g of metallic sodium.

Given:
m (Na) = 23 g
To find:
m (Cl2) -?
V (Cl2) -?
Decision:
2Na + Cl2 = 2NaCl, – we solve the problem based on the composed reaction equation:
1) Find the amount of sodium that has entered the reaction:
n (Na) = m: M = 23 g: 23 g / mol = 1 mol
2) We compose a logical expression:
If 1 mol Cl requires 2 mol Na,
then x mol Cl will require 1 mol Na,
then x = 0.5 mol.
3) Find the mass of chlorine consumed for the reaction:
m (Cl2) = n * M = 0.5 mol * 71 g / mol = 35.5 g
4) Find the volume of chlorine:
V (Cl2) = n * Vm = 0.5 mol * 22.4 l / mol = 11.2 l.
Answer: m (Cl2) = 35.5 g; V (Cl2) = 11.2 l.