Sun December 25, 2011 By: Bookie C


Expert Reply
Mon December 26, 2011
Law of reciprocal proportions states that "when two different elements separately combine with the fixed mass of third element, the proportion in which they combine with one another shall be either in the same ratio or some simple multiple of it". For example, when two elements C and O separately combine with H to form methane (CH4) and water (H2O) respectively; in methane 3g of C  combine with 1g of hydrogen, and in water (H2O) 8g of O combines with the same (fixed) mass i.e (1g) of H. Now when C and O combine with each other to form carbon dioxide (CO2), they do so in the same proportion i.e. 12:32 = 3:8 parts by mass.
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