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5 April, 08:11

When a 3.22 g sample of an unknown hydrate of sodium sulfate, na2so4 ⋅ h2o (s), is heated, h2o (molar mass 18 g) is driven off. The mass of the anhydrous na2so4 (s) (molar mass 142 g) that remains is 1.42 g. The value of x in the hydrate is?

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  1. 5 April, 08:15
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    The value of X is 10 hence the formula of unknown hydrate sodium sulfate is NaSO4.10 H20

    calculation

    step 1:find the moles of NaSO4 and the moles of H2O

    moles = mass/molar mass

    moles of Na2SO4=1.42:142=0.01 moles

    moles of H20 = mass of H2O/molar mass of H2O

    mass of H2O = 3.22-1.42=1.8g

    mole of H2O is therefore 1.8:18=0.1 moles

    step 2: find the mole ratio by dividing each mole by smallest number of mole (0.01)

    that is Na2So4 = 0.01/0.01 = 1

    H2O = 0.1/0.01=10
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