Question

10/9 major u1lc2 summative (25)
match the unbalanced chemical equations to the correct coefficients
cu + mgcl₂ → cucl₂ + mg
na + o₂ → na₂o
s₈ + o₂ → so₃
1, 1, 1, 1 4, 1, 2 1, 12, 8

Explanation:

Step1: Balance Cu + MgCl₂ → CuCl₂ + Mg

This equation is already balanced. The coefficients are 1, 1, 1, 1 as there is 1 Cu, 1 Mg and 2 Cl on both sides.

Step2: Balance Na + O₂ → Na₂O

For oxygen balance, we need 2 moles of Na₂O for 1 mole of O₂. And to balance Na, we need 4 moles of Na. So the coefficients are 4, 1, 2.

Step3: Balance S₈ + O₂ → SO₃

For sulfur balance, we have 8 moles of S on the left - hand side, so we need 8 moles of SO₃. For oxygen balance, since there are 24 oxygen atoms in 8 moles of SO₃, we need 12 moles of O₂. So the coefficients are 1, 12, 8.

Answer:

Cu + MgCl₂ → CuCl₂ + Mg: 1, 1, 1, 1
Na + O₂ → Na₂O: 4, 1, 2
S₈ + O₂ → SO₃: 1, 12, 8