Question

How many kilograms of chlorine gas us needed to produce 45.0 grams of hydrochloric acid?

Answer 1

2H + Cl₂ $\to$ 2HCl

moles of HCl = 45.0g/(36.458g/mol)

= 1.23 moles

2 molecule of HCl = 1 molecule of Cl₂

1.23 moles of HCl = 0.615 moles of Cl₂

Grams of Cl₂ needed = 0.615 × 70.906

= 43.60g

Convert 43.60 g to kg = 0.0436 Kg