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An unknown compound A (Mn(x)O(y)) compo...

An unknown compound A `(Mn_(x)O_(y))` composed of manganese and oxygen , has 36.7% oxygen by weight. When 8.7 g of A is heated with HCl it liberates `Cl_(2)` gas as per the following reaction:
`Mn_(x)O_(y) +HCl rarr MnCl_(2)+Cl_(2)+H_(2)O` (unbalanced)
The volume of `Cl_(2)` gas at STP obtained when 8.7 gm of compound A is heated with excess of HCl , (assume molecular formula and , empirical formula to be same):

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