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White vitriol (hydrated zinc sulphate) i...

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.

Text Solution

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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.
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Knowledge Check

  • A metal sulphate is isomorphous with ZnSo_(4).7H_(2)O . The % of metal content is 9.87% in this metal sulphate, find the weight of the metal in this sulphate.

    A
    40.3
    B
    36.3
    C
    24.3
    D
    11.3

  • The sulphate of a metal A contains 20% of M. This sulphate is isomorphous with ZnSO_(4).7H_(2)O . The atomic mass of M is

    A
    `12`
    B
    `24`
    C
    `36`
    D
    `48`

  • The sulphate of a metal M contains 9.87% of M , This sulphate is isomorphous with ZnSO_(4).7H_(2)O . The atomic weight of M is

    A
    (a)`40.3`
    B
    (b)`36.3`
    C
    (c )`24.3`
    D
    (d)`11.3`

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