x g of a substance A combines with y g of a substance B and forms(x+1)g and (y-1)g of the new substances C and D,respectively. show that these observations are in accordance with the law of conservation os mass[A+B changes into C+D]

The Law of Mass Conservation states that mass can neither be created nor destroyed.

Or more simply, the mass of substances produced (products) by a chemical reaction is always equal to the mass of the reacting substances (reactants).

  A          +   B     C           +            D

  xg            yg          ( x+1)g           (y-1)g

 A + B               C      +        D

(x+y) g                    [(x+1) + (y -1)]g

A + B               C      +        D

(x+y)g                           (x+y) g