Question

PLEASE HELP! Dealing with molality and pressure

Calculate the morality of a solution containing 0.755 mol glucose and 1.75 kg of water. 0.875 m 0.583 m 0.431 m 580 m 0.850 m What mass of a 0.66 m ammonium nitrate(80.04 g/mol) solution will contain 0.15 mol of solute? 227 g 239 g 440 g 493 g 4453 g What is the morality of a sucrose (C_12H_22O_11) solution that produces an osmotic pressure of 2.65 atm at 25 degree C? 0.0349 M 0.127 M 0.0127 M 0.108 M 0.398 M A 15.0mg sample of a protein was dissolved in water to produce 5.00 mL of solution at 25.1 degree C. The osmotic pressure of this solution was measured and found to be 6.50 tarr. What is the molar mass of this protein? 427 g/mol 941 g/mol 8580 g/mol 4270 g/mol 561 g/mol Eugenel is one of the compounds responsible for the flavor of cloves. A 222-mg sample of Eugenel was dissolved in 1.00 g of chloroform (K_b=3.63 degree C/m), increasing the boiling point of chloroform by 3.68 degree C. What is the molar mass of cugenol 82.0 g/mol 125 g/mol 164 g/mol 193 g/mol 219 g/mol

Answer 1

16)
molality = number of moles of solute / mass of solvenet in Kg
                  = 0.755/1.75
                  = 0.=431 m

17)
molality = number of moles of solute / mass of solvenet in Kg
0.66 = 0.15 / mass of solvenet in Kg
mass of solvenet in Kg = 0.227 Kg
mass of solvent= 227 g
mass of solute = number of moles * molar mass
                               = 0.15*80.04
                               = 12
mass of solution = 227 g + 12 g = 239 g
Answer: b

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