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Bath salts such as epsom contain hydrate salts such as mgso4·7h2o (magnesium sulfate heptahydrate). When heated, water is released as vapor and anhydrous mgso4 remains. Determine how many moles of vapor are released when 15. 5 g of mgso4·7h2o are heated. Hint: include h2o when calculating the molar mass.

Answer :

Ogorwynego

The moles of vapor released is 0.357 mol/H2O

The molar mass of the salt is the same as that of water times the moles of H2O

mgso4·7h2o

This is also the same as:

Molar mass of (MgSO₄) + 7 * molar mass of (H₂O)

Molar mass of (MgSO₄) =  168g/mol

molar mass of (H₂O) = 18 g/mol

mgso4·7h2o = 168 +7*18

= 168+126

= 294g/mol

15.5 mols of mgso4·7h2o

[tex]15.5*\frac{126}{294} *\frac{1}{18}[/tex]

= 0.357

The moles of vapor released is 0.357 mol/H2O

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