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| 1. |
White vitriol (hydrated zinc sulphate) is isomorphous with MgSO_(4).7H_(2)O white vitriol contains 22.95% zinc and 43.9% of water of crystallisation. Find the atomic mass of zinc. |
| Answer» Solution :The formula of white vitriol should be `ZnSO_(4),7H_(2)O` as it is isomorphous to `MgSO_(4).7H_(2)O`, i.e. 7 water molecules are associated with one zinc atom, `7H_(2)O=7xx18=126`. MASS of Zn with which 126 parts of water by mass are associated `=(22.95)/(43.90)xx126=65.87`=ATOMIC mass of zinc. | |