Reversible and irreversible reactions. Chemical equilibrium
Answers are for parents and teachers.
1
For 2SO₂ + O₂ ⇌ 2SO₃ at equilibrium [SO₃] = 6, [SO₂] = 3, [O₂] = 2 mol/L. Find K.
2
2
For H₂ + I₂ ⇌ 2HI, K = 16 and [H₂] = [I₂] = 2 mol/L. Find [HI].
8 mol/L
3
For PCl₅ ⇌ PCl₃ + Cl₂ at equilibrium [PCl₃] = [Cl₂] = 6 and [PCl₅] = 12 mol/L. K = ?
3
4
Why is BaCl₂ + Na₂SO₄ → BaSO₄ + 2NaCl considered irreversible?
BaSO₄ leaves the system as a precipitate.
5
Why does adding a reagent not change K even though the concentrations change?
K depends only on temperature; at the new equilibrium the concentrations settle so that the ratio again equals K.