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GAY LUSSAC'S LAW OF COMBINING VOLUME:


At given temperature and pressure the volumes of all gaseous reactants and products bear a simple whole number ratio to each other.
For example:
I.e. one volume of hydrogen reacts with one volume of chlorine to form two volumes of HCl gas. I.e. the ratio by volume which gases bears is 1:1:2 which is a simple whole number ratio.
Similarly other examples are:
ILLUSTRATIVE EXAMPLE (14):  In the reaction
the ratio of volumes of nitrogen, hydrogen and ammonia is 1: 3 : 2. These figures illustrate the law of:
                         (A) Constant proportions                               (B) Gay-Lussac
                        (C) Multiple proportions                                 (D) reciprocal proportions
SOLUTION:  The above ratio of 1: 3: 2 illustrates the Gay-Lussac law of combining volume. 
                          Hence (B) is correct.
ILLUSTRATIVE EXAMPLE (15): How much volume of oxygen will be required for complete combustion of 40 ml of acetylene (C2H2) and how much volume of carbon dioxide will be formed? All volumes are measured at NTP.
SOLUTION:
So for complete combustion of 40 ml of acetylene, 100 ml of oxygen are required and 80 ml of CO2 is formed.

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