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16 July, 15:01

Opal is a hydrated form of silica. If a laboratory analysis of a sample of opal reveals it to contain29.2% Si, 33.3%O, and 37.5% H 22 O, what is its empirical formula?

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  1. 16 July, 15:20
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    Let us assume that there is a 100g sample of Opal. The masses of each element will be:

    29.2g Si

    33.3g O

    37.5g H2O

    Now we divide each constituent's mass by its Mr to get the moles present

    Si: (29.2 / 28) = 1.04

    O: (33.3 / 16) = 2.08

    H2O: (37.5 / 18) = 2.08

    Now we divide by the smallest number and obtain:

    Si: 1

    O: 2

    H2O: 2

    Thus, the empirical formula of Opal is:

    SiO2. 2H2O
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