A ionic compound XY contains 0.050 mol of H2O for every 0.00998mol of ionic compound. The generalized formula for the hydrate is.....?

1 Answer
Ernest Z.
Jun 9, 2018

The formula for the hydrate is "XY"·5"H"_2"O"XY⋅5H2O.

Explanation:

The general formula of the hydrate is "XY"·n"H"_2"O"XY⋅nH2O.

There are nn mol of water for every mole of "XY"XY.

∴ n = ("moles of H"_2"O")/"moles of XY" = (0.050 color(red)(cancel(color(black)("mol"))))/("0.009 98" color(red)(cancel(color(black)("mol")))) = 5.01 ≈ 5

n must be an integer, so the formula of the hydrate is "XY"·5"H"_2"O".

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