Paper 2 · chemical equilibrium

0.6 mol of $SO_2$ and 2.0 mol of $O_2$ were mixed and allowed to reach equilibrium, $2SO_2(g) + O_2(g) \rightleftharpoons 2SO_3(g)$ . At equilibrium 0.4 mol of $SO_3$ was present. The amounts of $SO_2$ and $O_2$ remaining are

A0.2 mol and 1.6 mol

B0.2 mol and 1.8 mol

C0.4 mol and 1.8 mol

D0.6 mol and 1.8 mol

Explanation: 0.4 mol of

SO_3

requires 0.4 mol of

SO_2

and 0.2 mol of

O_2

, leaving 0.2 mol

SO_2

and 1.8 mol

O_2

Derived from ZIMSEC Chemistry Paper 2, November 2006, Q1

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