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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 ?

Text Solution

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The correct Answer is:
A, B
`Pv = nRT = (W)/(Mw) RT`
`:. (700)/(760) xx (1336)/(1000) = (W)/(44) xx 0.0821 xx 300`
or `W = 2.198 g CO_(2)`
The molecular mass of any metal carbonate is `2E + 60`,
Where `E` is the equivalent mass of the metal. So
`(2E + 60)/(4.215) = (44)/(2.193)`
`E = 12.188 g`
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