use raoult's law for this
.. PA = (P*A) x (χA)
where
.. PA = vapor pressure of component A over the liquid
.. P*A = vapor pressure of pure component A
.. χA = mole fraction of component A in the liquid phase
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the key here is for you to recognize that glucose is non-volatile. So that the pressure over the solution will = the vapor pressure of WATER in that solution.
i.e.. that "A" in the above equation = H2O.. and Ptotal = PA
AND... you need to convert from 1m glucose to mole fraction H2O
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can YOU finish?
hints....on that conversion.
.. (1) use dimensional analysis
.. (2) 1m means 1 mole glucose / 1kg H2O
.. (3) assume 1kg H2O, convert that to moles H2O and moles glucose
.. (4) mole fraction H2O = mole H2O / (mole glucose + mole H2O)
.. (5) your setup should look like this
.. .. . ..1kg H2O... 1mol glucose
.. .. ... --- --- ----- x -- --- --- --- ---- = __ mol glucose
.. .. .. .. .. ..1.. .. .. .. . .1kg H2O
.. ... .. . 1kg H2O.. .. .1000g... .. .1 mol
.. ... ... ---- ----- --- x ---- ---- --- x --- ---- --- = __mol H2O
... ... ... .. ...1... ... .. ... 1kg.. ..... .18.02g
.. (5) Ptotal = (P*A) x (χA)
