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Practice ProblemATTEMPT
Calculate the vapor pressure of a solution made by dissolving 115 g of urea
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Chemistry
- What is the total vapor pressure of a solution containing 35.8 g benzene (C6H6, molar mass = 78.11 g/mol) and 56.7 g toluene (C7H8, molar mass = 92.14 g/mol) at 25.0 °C? (Given: P°benzene = 95.1 mm Hg, P°toluene = 28.5 mm Hg) Select one: a.17.2 mm Hg b.25.7 mm Hg c.56.9 mm Hg d.41.3 mm Hgarrow_forwardSubmit Answer If 22.2 grams of an aqueous solution of calcium acetate, Ca(CH3COO)2, contains 4.73 grams of calcium acetate, what is the percentage by mass of calcium acetate in the solution? % Ca(CH3COO)2 282 F4 % 5 T G F5 B Retry Entire Group Cengage Learning Cengage Technical Support Y H [Review Topics) [References] Use the References to access important values if needed for this question. S & 6 i 7 MacBook Air F6 N 9 more group attempts remaining U F7 J 8 M I DII K ( 9 DD F9 O L ) O A F10 P : ; command option 4 F11 { [ ? 1 Previous + 1 Save and Exit 4) Next> F12 } ] S Relaunch to update delete + return shift Ⓒarrow_forwardA solution is composed of 0.431 mole of glycerin (C3H5(OH)3), which is a nonvolatile solute, in 50.0 g of water (molar mass = 18.02 g/mol). What is the freezing point of the solution? (The freezing point depression constant for water, Kf = 1.86 °C/m) (A) 0.80 °C (B) -8.62 °C (C) -16.0 °C (D) 8.62 °Carrow_forward
- Vitamin B2, riboflavin, is soluble in water. If 0.833 g of riboflavin is dissolved in 18.1 g H2O, the resulting solution has a freezing point of -0.227oC. Kf = 1.86oC/m (a) What is the molar mass of riboflavin? Note the van't Hoff factor of riboflavin (b) What is the molecular formula of riboflavin if combustion analysis shows it to consist of 54.25% C, 5.36% H, 25.5% O and 14.89% N?arrow_forwardCalculate the freezing points of 0.17 m glycerol in ethanol and 1.92 mol of naphthalene, C10H8, in 16.8 mol of chloroform, CHCl3. (Kf(ethanol)=1.99, Kf(CHCl3)=4.68) (A) -114.3oC and -59.0oC(B) -114.3oC and -63.5oC(C) -114.9oC and -68.0oC(D) -114.9oC and -64.0oC(E) -114.3oC and -64.0oCarrow_forwardVitamin B2, riboflavin, is soluble in water. If 0.833 g of riboflavin is dissolved in 18.1 g H2O, the resulting solution has a freezing point of -0.227oC. Kf = 1.86oC/m(a) What is the molar mass of riboflavin?(b) What is the molecular formula of riboflavin if combustion analysis shows it to consist of 54.25% C, 5.36% H, 25.5% O and 14.89%N?arrow_forward
- Explain the following :(i) Henry’s law about dissolution of a gas in a liquid(ii) Boiling point elevation constant for a solvent(b) A solution of glycerol (C3H8O3) in water was prepared by dissolving some glycerol in 500 g of water. This solution has a boiling point of 100.42°C. What mass of glycerol was dissolved to make this solution?(Kb for water = 0.512 K kg mol-1)arrow_forwardA solution is composed of 0.431 mole of glycerin (C3H5(OH)3), which is a nonvolatile solute, in 50.0 g of water (molar mass = 18.02 g/mol). What is the freezing point of the solution? (The freezing point depression constant for water, Kf = 1.86 oC/m) (A) 0.80 oC (B) -8.62 oC (C) -16.0 oC (D) 8.62 oCarrow_forwardCalculate the molality of each of the following solutions:(a) 583 g of H2SO4 in 1.50 kg of water—the acid solution used in an automobile battery(b) 0.86 g of NaCl in 1.00 × 102 g of water—a solution of sodium chloride for intravenous injection(c) 46.85 g of codeine, C18H21NO3, in 125.5 g of ethanol, C2H5OH(d) 25 g of I2 in 125 g of ethanol, C2H5OHarrow_forward
- 9. A total of 49 g of a compound with the molecular formula (H2CO)x is dissolved in 500 g of water (Kf=1.86°C/m) If the freezing point of this compound is -0.93 °C and Ar C = 12, H =1, O = 16, then the value of X is.......... (A) 12 (B) 10 (C) 8 (D) 6 (E) 4arrow_forward(a) Calculate the vapor pressure of water above a solutionprepared by dissolving 28.5 g of glycerin 1C3H8O32 in 125 g of water at 343 K. (The vapor pressure of water isgiven in Appendix B.)arrow_forwardf 1.826 g of an unknown substance dissolved in 28.640 g of glacial acetic acid (Kf =3.90 ⁰C/m)lowers the freezing point of acetic acid by 1.4 ⁰C, what is the molecular weight of the unknownsubstance?arrow_forward
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