Question

D Question 40 15 pts Calculate the mole fraction, molarity and molality of NH3 if it is in a solution composed of 30.6 g NH3 in 81.3 g of H20. The density of the solution is 0.982 g/mL and the density of water is 1.00 g/mL. (The molar mass for NH3 is 17 and 18 for H20). Answers are to be shown to 3 significant digits (X.XX or 0.XXX or XXX) 1. The mole fraction for NH3 is 2. The molarity of NH3 is 3. The molality for NH3 is

Answer 1

WWW Given, Mass of Ammonia ( Nttz) = 30.69 mass of water (to) = 81.39 Molecular maus Of Ammonia = 179 molecular mous of +20 = 189 , Mole fonction of Nitty = =-* NH₃ + MH₂O 30.6 813 en 77 + 78 18+45 ã =0.286 X - mole fraction = 0.285) - Molarity of NH₃ = mass of Nitt3 1000 MW of Nittz volume of H2O volume of the man 818-83ml Volume of solution - Mass 81.3 +30.6 = 114ml . Density 0.982 M = 306x1000 - 11888.77 = 15.8 FM=15.8). 17 114 3 Molality of Notly a mass of Nitt3 x 1000 Mwl of Nittz wt of Solvent - 300 x 1000 m = 22-1] cs Scanned with L CamScanner 30:6 1000