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15 February, 04:21

If 6.50 g of the unknown compound contained 0.217 mol of C and 0.433 mol of H, how many moles of oxygen, O, were in the sample?

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  1. 15 February, 07:58
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    First, you should find the mass of carbon and hydrogen in the 6.5g of the unknown compound.

    mass of carbon and hydrogen in the compound

    = (0.217*12) + (0.433*1)

    =3.037g

    mass of oxygen in the compound

    =6.5-3.037

    =3.463g

    no of mol of oxygen

    =3.463:16

    =0.216 mol
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