Smog is common in cities throughout the world. One component of smog is PAN (peroxyacylnitrate) which consists of 20.2% C, 11.4% N, 65.9% O and 2.50% H by mass. Determine the empirical formula of PAN, showing your working.

\({{\text{C}}_{\text{2}}}{\text{N}}{{\text{O}}_{\text{5}}}{{\text{H}}_{\text{3}}}\);

No penalty for use of 12, 1 and/or 14.

Award [1 max] if the empirical formula is correct, but no working shown.

It was pleasing to see the majority of candidates determine the correct empirical formula of PAN. Also, candidates showed the proper working with all the appropriate steps.