Chemistry Past Questions and Answers

What volume of hydrogen will be produced if 100cm<sup style='font-size: smaller;'>3</sup> of ammonia is completely decomposed at constant temperature and pressure? The equation for reaction is 2NH<sub style='font-size: smaller;'>3(g)</sub> → N<sub style='font-size: smaller;'>2(g)</sub> + 3H<sub style='font-size: smaller;'>2(g)</sub>

Calculate the mass of chlorine gas which occupies a volume of 1.12 dm\(^3\) a volume of 1.12 dm\(^3\) at s.t.p [Cl = 35.5, 1 mole og gas occupies 22.4 dm\(^3\) at s. t. p ]

Determine the mass of sulphur (IV) oxide obtained when 91.0g of oxygen reacts completely with sulphur according to the following equation: S<sub style='font-size: smaller;'>(s)</sub> + O<sub style='font-size: smaller;'>2(g)</sub> → SO<sub style='font-size: smaller;'>2(g)</sub> [S = 32; O = 16]

The gas given off when NH<sub style='font-size: smaller;'>4</sub> Cl is heated with an alkali is

A major factor considered in selecting a suitable method for preparing a simple salt is its