Ice-cream Posted May 13, 2005 Share Posted May 13, 2005 can i have some confirming plz? 1. The vapour pressure of pure water at 25 degrees c is 23.8 mmHg. Determine the vapour pressure of water at 25 degrees C above a solution containing 33.2 g of urea (a nonvolatile, nonelectrolyte, MW = 60g/mol) dissolved in 75 g of water. (i found no. of moles of urea = 0.5533 and no. of moles of water = 4.1667. since P(solution) = x(solvent) x Pure pressure (solvent), P(solution) = 21.01 mmHg.) does anyone agree with my answer?) 2. Calculate the reaction enthalpy in kJ for the formation of anhydrous aluminium chloride 2Al(s) + 3Cl2(g) --> 2AlCl3(s) from the data: 2Al(s) + 6HCl(aq) --> AlCl3(aq) + 3H2(g) delta H = -1049 kJ HCl(g) --> HCl (aq) delta H = -73.5 kJ H2(g) + Cl2(g) --> 2HCl(g) delta H = -185 kJ AlCl3(s) --> AlCl3(aq) delta H = -323 KJ (the answer i got was -1399kJ...does anyone agree?) thanx Link to comment Share on other sites More sharing options...
Ice-cream Posted May 15, 2005 Author Share Posted May 15, 2005 so doesn't any1 agree with my answers?? Link to comment Share on other sites More sharing options...
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