1. N2 (g) + 3H2 (g) --> 2NH3

(i)what volume of hydrogen (R.T.P) is needed to react exactly with 2.8kg of N2?

(ii). what mass if ammonia would be produced assuming that r*n was complete?

(iii). what mass of ammonium nitrate fertilizer could be made from this amount of ammonia?

2. copper (II) nitrate can be prepared by adding copper(II) oxide to nitric acid. what is the maximum mass of copper (II) nitrate which can be formed from 150cm3 of nitric acid of concentration 0.5mol/dm-3?

3. what mass of potassium hydrogen carbonate must be added to sulphuric acid to produce 8.7g of potassium sulphate?

4. 50cm3 of an acid with formula HnX and concentration 0.4mol/dm-3 are needed to neutralize 100cm3 of potassium carbonate solution of cone 13.8g/dm-3. calculate the value of n in HnX.