mols K3PO4 = grams/molar mass
mols H2O = grams/molar mass
Total mols = ?
XK3PO4 = ?
XH2O = ?
NOTE. Remember i, the van't Hoff factor for H3PO4 is 3and take that into account in the above, or at least before calculate ing vapor pressure.
By how much will the vapor pressure of water decrease if a solution at 40.0°C is produced by dissolving 16.0212 g of K3PO4 (formula mass = 212.30 g/mol) with 40.8480 g of water. The vapor pressure of pure water at this temperature is 55.30 mmHg. If the solute is ionic, assume that it is completely ionic!
we use Raoults law but i don't know how to use the g given
1 answer