Plzzzzzzzzzz explain LAW OF RECIPROCAL PROPORTIONS?????????

Asked by shangupta2008 | 12th Sep, 2010, 12:23: AM

Expert Answer:

law of reciprocal proportion :- the ratio in which two elements combine separately with fixed weight of the third element is either the same or is a simple whole number multiple of the ratio in which these elements combine with each other.
 
for example:- consider three elements hydrogen(H), Oxygen (O) , and carbon (C) . let H and O combine with C to form  Carbondioxide (CO2) and methane (CH4) respectively . At the same time H and O also combine with each other to form H2O
let us keep 1 part of C as the fixed weight.
 
In CH4
12 parts by weight of carbon have combined with hydrogen = 4 parts
thus 1 part by weight of carbon has hydrogen = 4/12 parts
 
In CO2
12 parts by weight of carbon have combined with oxygen = 32 parts
thus 1 part by weight of carbon has combined with oxygen = 32/12 parts
 
Thus the ratios by weight of oxygen and hydrogen  combining with fixed weight of carbon in the two compound  is
       4/12: 32/12 = 1:8 ( the ratio is not the same)-------(i)
 
In H2O
2 parts by weight of hydrogen have combined with oxygen = 16 parts
thus H and  O have combined in the ratio 2:16 = 1:8--------(ii)thus (i)and (ii)have same ratios.

Answered by  | 12th Sep, 2010, 01:19: AM

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