Questions submitted 1 2 0 5m sugar CH6H12O6 0 35m glycol HOCH2CH2OH a non volatile solute 0 2m Na2SO4 0 2m KBr 3 4 5 You are examining forensics data for a court case and need to identify an analgesic painkiller It could be acetylsalicylic acid aspirin MW 180 5g mol ibuprofen advil MW 206 g mol or acetaminophen tylenol MW 151 2 g mol A mixture of the unknown is prepared by mixing 10 0grams of unknown and diluting to 250 mL ethanol The density of this solution is 0 8g mL Identify the unknown based upon the following The boiling point of the mixture is 78 8 C Kb C m Ethanol 1 22 Normal BP Ethanol 78 5 C a What is the molecular weight of the unknown compound b What is the identity of the unknown compound Q6 The Raoult s law equation with the van t hoff factor equation Raoult s law with electrolytes a How many moles of Sodium Sulfate are in the solution b How many moles of water are in the solution c What is the van t hoff factor d What is the change in vapor pressure Questions by me 7 Identify if each statement is True or False regarding the solubility of CO2 g in H2O l a CO2 is not soluble in H2O b CO2 will be more soluble at lower temperatures c The solubility of CO2 is independent of the temperature d CO2 will be more soluble at lower pressures 8 At a particular temperature the solubility of O in water is 0 0500 M when the partial pressure is 0 120 atm What will the solubility be when the partial pressure of O is 0 360 atm 9 Forming solution A from liquid B and liquid C is endothermic Increasing the temperature of the solution will increase decrease not change the solubility of B 10 An aqueous solution of glucose MM 180 2 g mol has a molality of 5 21 m and a density of 1 20 g mL What is the molarity of glucose in the solution 11 A solution commonly used for intravenous injections is normal saline a 0 16 M solution of sodium chloride in water Calculate the mass of sodium chloride needed to prepare 250 mL of normal saline solution 12 A 10 0 by mass aqueous solution of hydrogen chloride has a density of 1 046 g mL What is the molarity of the solution 13 Calculate the vapor pressure of a solution of 44 0 g glycerol C3H8O3 in 500 0 g of water at 25 0 C The vapor pressure of pure water at 25 0 C is 23 76 Torr Report your final answer in atmospheres 14 How many grams of glucose C6H12O6 per liter should be used for an intravenous solution to match the 7 65 atm at 37 0 C osmotic pressure of blood 15 If 1 60 g of naphthalene C10H8 a nonvolatile solute with MW 128 g mol were dissolved in 20 0 g of benzene at what temperature would you expect the solution to freeze under 1 0 atm of externally applied pressure Kf 5 12 C m Normal FP 5 5 C 16 An aqueous solution contains 0 97g L of an organic compound The osmotic pressure of this solution is 0 0828 atm at 25 C What is the molar mass of this compound 17 How many grams of NaCl would need to be added to 1001 g of water to increase the boiling temperature of the solution by 1 500 C Kb for water is 0 5100 C m 18 What is the osmotic pressure in atm of a 0 201 M solution of Ca NO3 2 at 37 0 in atm Assume complete dissociation 19 Which of the following changes alter the solubility of a solid in a liquid Temperature pressure container size solute size agitation MORE STUDENT SUBMISSION
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