Asked by Dipika Dang
Molality of aqueous solution of urea is 4.What will be the mole fraction ofH2O?
Answers
Answered by
Jai
Molality units is moles of solute per kilogram solvent.
In this case, we have
m = 4 moles urea / 1000 g H2O
Note that water has molar mass of 18 g/mol.
Getting the moles of water, we need to divide the given mass by its molar mass:
1000 g H2O / 18 g/mol = 55.56 mol H2O
Since we have 4 moles of urea, the total number of moles is
55.56 mol H2O + 4 mol urea = 59.56 moles
Finally, the mole fraction of H2O is
55.56 / 59.56 = 0.933
hope this helps~ `u`
In this case, we have
m = 4 moles urea / 1000 g H2O
Note that water has molar mass of 18 g/mol.
Getting the moles of water, we need to divide the given mass by its molar mass:
1000 g H2O / 18 g/mol = 55.56 mol H2O
Since we have 4 moles of urea, the total number of moles is
55.56 mol H2O + 4 mol urea = 59.56 moles
Finally, the mole fraction of H2O is
55.56 / 59.56 = 0.933
hope this helps~ `u`
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