page 06 12. Which line in the table is correct for water condensing? ∆H ∆S A positive negative B negative negative C positive positive D negative positive 13. The results in the table were obtained for the reaction X  +  2Y  ↓  Z Experiment [X] (mol l−1) [Y] (mol l−1) Initial rate (mol l−1 s−1) 1 0·030 0·030 0·0064 2 0·060 0·030 0·0128 3 0·030 0·015 0·0064 From these results, the rate equation is A rate = k[X] B rate = k[Y] C rate = k[X][Y] D rate = k[X][Y]2. 14. The rate of a chemical reaction is second order overall. The units for the rate constant, k, are A mol l−1 s−1 B l mol−1 s−1 C l2 mol−2 s−1 D l−2 mol2 s−1.