Question

When `4.215 g` of metallic carbonate was heated in a hard glass tube, the `CO_(2)` evolved was found to be measured `1336 mL` at `27^(@)C` and `700 mm` pressure. What is the equivalent weight of the metal?

Answer 1

Correct Answer - 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`