Help, chemistry problem!?

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As forensic chemist, you receive a package that contains a mix of heroin and lactose (C12H22O11). To determine the quantity of each in the mixture, you dissolve 6.45 g of the mix in water in a 100.0 mL volumetric flask. The resulting solution has an osmotic pressure of 3360 mm Hg at 25 degrees celcius. HOW MANY GRAMS OF HEROIN ARE IN THE BAG.... heroin=369 g/mol
 
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