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6 September, 03:48

100 g of an inorganic compound X. 5H2O containing a volatile impurity was kept in an oven at 150 degree celcius for 60 minutes. the weight of residue after heating is 8g. the percentage of impurity in X was?

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  1. 6 September, 06:15
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    150°C

    X*5H₂O → X + 5H₂O↑

    m₀=100 g

    m (X) = 8 g

    M (H₂O) = 18.0 g/mol

    n (H₂O) = 5 mol

    the mass of the water

    m (H₂O) = M (H₂O) n (H₂O)

    m (H₂O) = 18.0*5=90 g

    the mass of the residue after removal of water

    m' (X) = 100-90=10 g

    the percentage of impurity in X*5H₂O

    w (imp) = [m' (X) - m (X) ]/m₀

    w (imp) = [10-8]/100=0.02 (2%)
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