CHE-1102 Lecture Notes - Lecture 3: Colligative Properties, Mole Fraction, Molar Mass

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coralporcupine226

16 Aug 2016

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Chapter 12 - mixtures at the molecular level: properties of solutions. Mass % = (mass of solute / total mass of solution) * 100. 1. 92 g nacl (s) is dissolved into 50. 0 g h2o. % nacl = (1. 92 g / 51. 92 g) * 100. Then add additional water until the 1l mark is reached. Might not be exactly 1l of water - probably will be less. 0. 01 l * 0. 25 mol/l = 0. 025 mol nh4cl. 0. 025 mol nh4cl * 53. 491 g/mol nh4cl. Parts per million, ppm = (mass of solute / total mass of solution) * 1,000,000. Molality, m = moles of solute / kg of solvent. Mole fraction, x = moles of substance / total moles of mixture. Osha mandates a limit of 35 ppm for co gas exposure in the workplace. The tunnel through the cumberland gap (on 25e) was found to contain 23 g co in a 325 kg sample of air.

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bromine br2(l) is more soluble in dichloromethane

T. The solublity of ones fn re and decreasing pressuure (1) increasing pressure and increasing temperature (3) decreasing temperature and increasing pressure (2) ally decreases with increasing temperature and decreasing pressure (4) decreasing temperature and decreasing pressure. 8. When a nonvolatile solute s uch as ammonium sulfate is dissolved in a solvent like water, one of the (1) a decrease in the boiling point of the liquid (2) an increase in the vapor (4) a decrease in the observed effects is pressure of the solvent freezing point of the liquid (3) an increase in the vapor pressure of the solute . In which of the following solvents would you expect kBr to be most soluble? (1) CClu (carbon tetrachloride) 0. Calculate the mass percent of HOCH-CH2OH in a solution made by dissolving 6.4 g of HOCHCH20H in 11. During osmosis (1) pure solutes diffuse through a membrane but solvent does not (2) pure solvent (2) CHsCH2OH (ethanol) (3) CaHe (benzene (4) CoH14 (hexane) 48.2 g of water. (1)13.3% (2) 6.9% (3) 7.4% (4) 11.7% diffuses through a membrane but solutes do not (3) pure solvent and a solution both diffuse at the same time through a membrane (4) gases diffuse through a membrane into a solution and build up pressure 12. Which of the following gases is expected to have a highest solubility in water? (1) HCI (2) N2 (3) CH (4) O2 13. How many grams of water are needed to dissolve 27.8 g of ammonium nitrate NH NOs in order to prepare a (1)0.157 g (2) 769 g (3) 36.2 9 0.452 m solution? The molar mass of NH4NOs is 80.04 g/mol. (4) 57.0 g (1) enough solvent to make 14. To make a 3.0 m solution, one could take 3.00 moles of solute and add L of solution (2) enough solvent to make 1.00 kg of solution (3) 1.00 L of solvent (2) 1.00 kg of solvent 15. What volume of 2.00 M CHOH solution is needed to provide 0.500 mol of CHJOH? (1)3,.12 mL (2) 10.0 mL (3) 167 mL (4) 250 mL 16. Assuming 100% dissociation, which ofthe follow ng compounds is listed correctly with its van't Hoff factor? (4) Ala(SO4), i-5 (2) NH4N03, i#3 (3) Sucrose, i:0 (1) NaS0+/-2 17. Calculate the van't Hoff factor of NasPO in a 0.40 m solution whose freezing point is -2.6C. 15 pts]

CHE-1102 Lecture Notes - Lecture 3: Colligative Properties, Mole Fraction, Molar Mass

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