Hydrogen chloride
Answers are for parents and teachers.
1
How many mol HCl come from 234 g NaCl (2NaCl + H₂SO₄ → Na₂SO₄ + 2HCl)? M(NaCl) = 58.5 g/mol.
4 mol
2
How many litres of HCl form when 20 l of Cl₂ react with enough H₂ (same conditions)?
40 l
3
Find the density of HCl relative to hydrogen (Mᵣ = 36.5).
36.5 : 2 = 18.25
4
Write the structural formula H–Cl and the direction of shift of the shared pair.
H–Cl; the pair shifts towards chlorine (δ⁺ H, δ⁻ Cl).
5
Why are goggles, gloves and a fume cupboard needed with hydrogen chloride?
The gas and its mist burn eyes, skin and airways; the acid vapour is sharp and toxic.