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21 December, 22:52

If a certain compound has a formula XCl₃ what is the valency of X?

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  1. 21 December, 23:19
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    The general form of a compound can be written in the form of:

    [X (a) Y (b) ] ^ c

    Where a and b are subscripts, and c is the superscript of the whole formula.

    The relationship that we can derived here between the constants is:

    (valence of X) * a + (valence of Y) * b = c

    Since the formula obviously has no superscript, therefore c = 0. We also know in chemistry class that the valence of Cl is - 1, therefore:

    valence of X * 1 + (-1) * 3 = 0

    valence of X - 3 = 0

    valence of X = 3
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