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4.215 g a metallic carbonate was heated ...

4.215 g a metallic carbonate was heated in a hard glass tube and `CO_2` evolved was found to measure 1336 mL at 27°C and 700 mm pressure. What is the equivalent mass of the metal ?

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The correct Answer is:
12.15
`("Mass of metal carbonate")/("Mass of metal oxide") = ("Eq. mass of metal + Eq. mass of" CO_(3)^(2-))/("Eq. mass of metal + Eq. mass of " O^(2-))`
and Mass of metal oxide = Mass of metal carbonate - Mass of `CO_(2)`
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