Solutions Questions and Answers

At 25 C the vapor pressure of water is 23 8 torr What is the vapor pressure of a solution prepared by dissolving 97 0 g of C6H12O6 a nonvolatile solute in 146 g of water Assume the solution is ideal Psolution i 24 6 torr

Current Attempt in Progress At 25 C the vapor pressures of benzene C6H6 and toluene C7H8 are 93 4 and 26 9 torr respectively A solution made by mixing 96 0 g of benzene and 47 0 g of toluene is prepared At what applied pressure in torr will this solution boil

X Incorrect 0 0441 moles of iron III nitrate mass of the solution i 1179 46 Hint X Incorrect 0 0263 moles of Fe ions mass of the solution i Hint 109 04 g g

What is the vapor pressure at 20 C of an ideal solution prepared by the addition of 1 36 g of the nonvolatile solute urea CO NH 2 to 24 1 g of methanol CH3OH The vapor pressure of pure methanol at 20 C is 89 0 mmHg O 80 4 mmHg O2 67 mmHg 84 2 mmHg 86 3 mmHg O 8 51 mmHg

The boiling point at 1 00 atm of a solution containing 70 2 g of a nonionic solute and 482 g of water is 101 32 C Calculate the molar mass of the solute

At a particular temperature the solubility of O in water is 0 590 g L at an oxygen pressure of around 15 2 atm What is the Henry s law constant for O in units of mol L atm Recall Henry s Law concentration of gas kHP 0 280 0 0388 824 0 000121

Calculate the total pressure of an ideal solution consisting of 0 678 mol of benzene and 0 414 mol of toluene The vapor pressures of the pure components are 105 torr and 34 0 torr respectively Edit Format Table

What is the heat of vaporization kJ mol of liquid vibranium given its vapor pressure at 25 0 C is 10 0 mmHg and it has a normal boiling point of 202 C Report your final answer to 1 decimal place Your Answer

If 11 2 g of naphthalene C10H8 MW 128 17g mol is dissolved in 107 8 g of chloroform CHCl3 MW 119 4 g mol what is the molality of the solution Edit Format Table

Bonus Up to 0 5 pts What is the molality of a concentrated phosphoric acid solution that is 14 80 M and has a density of 1 685 g ml

True or False if I boil water in a closed container without adjusting temperature it will reach a point where no more water can evaporate

The solubility of 1 pentanol in water is 2 7 g per 100 g of water at 25 C What is the maximum amount of 1 pentanol that will dissolve in 4 1g of water at 25 C O 11 g O 0 0065g O 2 7 g O 0 65 g O 0 11 g

You try to boil water in a deep valley that is below sea level Will the water boil a Faster and at a hotter temperature than 100 C b Slower and at a hotter temperature than 100 C c Faster and at a cooler temperature than 100 C d Slower and at a cooler temperature than 100 C e This scenario should not change the boiling point

5 In the equation Cu 2 AgNO3 2 Ag Cu NO3 2 what is the mole ratio 1 point of silver nitrate to copper II nitrate O 1 1 O 1 2 O 2 1 4 1

you had 2 35 mol of NH3 a How many total atoms are there How many atoms of N are there b C How many atoms of H are there

An aqueous solution of ammonia NH3 has a concentration of 13 8 mol L and has a density of 0 904 g mL What are the mass percent and molality of NH3 in solution Mass percent NH3 25 9 Molality NH3 17 09 X mol NH3 kg H O

e vapor pressure of a solution containing 52 2 g glycerin C3 Hs Os in 145 6 g ethanol C H5OH is 38 8 torr at 20 C Calculate the vapor pressure of pure ethanol at 20 C suming that glycerin is a nonvolatile nonelectrolyte solute in ethanol por pressure torr

Consider the following solutions 0 010 m Na3PO4 in water 0 020 m CaBr2 in water 0 020 m KCl in water 0 020 m HF in water HF is a weak acid a Assuming complete dissociation of the soluble salts which solutions would have the same boiling point as 0 040 m C6H12O6 in water C6H12O6 is a nonelectro and b Which solution would have the highest vapor pressure at 28 C c Which solution would have the largest freezing point depression Drag and drop your selection from the following list to complete the answer 0 010 m Nas PO4 0 020 m CaBr 0 020 m HF 0 020 m KC1

Urea NH 2CO which is widely used in fertilizers and plastics is quite soluble in water If you dissolve 5 09 g of urea in 13 6 mL of water what is the vapor solution at 24 C Assume the density of water is 1 00 g mL The vapor pressure of water at 24 C is 22 4 mmHg X mmHg

Sulfuric acid and potassium hydroxide react according to the following balanced chemical equation 1 H SO4 2 KOH 2 H 0 1 K SO4 It takes 43 mL of 0 34 M KOH solution to neutralize 75 mL of your unknown H SO4 What is the molarity of your unknown acid solution 1st blank is for the number 2nd blank is for the units

1 Beer s Law A b M Explain what b and M stand for in the above equation and also give units for each What units would Absorbance A have if any

2 Absorbance for a 0 15 M solution of a particular compound is found to be 0 450 Would you expect Absorbance for a 0 30 M solution of the same compound to be higher lower or remain the same Explain

An unknown molecular compound has molar mass of 58 08 g mole If 9 59 x 1025 molecules of this unknown compound occupies a volume of 2 33 mL what is the density of this compound in g ml Answer in scientific notation with correct significant figures and enter g mL for the unit

You will need to calculate concentrations from a simple dilution in today s lab Assume you have a 0 182 M stock You are taking 9 0 of this stock and diluting it to 10 0 mL What will be the concentration after the dilution

Solution B Solution C 1000 ml 250 ml Which other solution above has the same molarity as Solution A Select one O Solution Conly OBoth B and C ONeither nor C Solution A 500 ml e 11 4 21 12 P 16 17 18 22 B 15 Finish attempt Tine leht 1 35 55

Identify CORRECT option O If boiling point molar mass are relatively comparable then a polar solvent will show higher ebullioscopic constant then a non polar solvent O A solution of water and iso butanol may form maximum boiling azeotrope on distillation For mixing of liquids benzene and toluene entropy change ASmix is positive O In a real solution of two volatile liquids the component which is in large excess follows henry s law

Q2 A mixture of A and B is to be separated by distillation Xf 0 45 concentration of distillate is 0 92 and waste is 0 05 the Reflex ratio is 2 find No of trays of the distillation columns if equilibrium line is noted as in the figure and the feed enters the column at boiling point YA 1 0p 0 8 0 6 0 4 T 0 2 mass transfor 0 6 0 8 1 0

Open the Gas Solubility Activity Section 13 2 Figure 13 8 to complete this worksheet 1 Count the number of dissolved gas particles in each of these cases Lowest Highest pressure pressure N 0 CO Coldest Hottest temperature temperature 2 Describe the relationship between pressure and gas solubility

Immunoglobulin G IgG formerly called gamma globulin is a principal antibody in blood serum A 0 807 g sample of immunoglobulin G is dissolved in water to make 0 178 L of solution and the osmotic pressure of the solution at 25 C is found to be 0 749 mbar Calculate the molecular mass of immunoglobulin G molecular mass g mol

When 4 16 g of a nonelectrolyte solute is dissolved in water to make 455 mL of solution at 25 C the solution exerts an osmotic pressure of 17 torr What is the molar concentration of the solution concentration How many moles of solute are in the solution moles of solute What is the molar mass of the solute M mol g mol

Assuming 100 dissociation calculate the freezing point T and boiling point T of 1 71 m K3 PO4 aq Colligative constants can be found in the chempendix Tf

A solution is made by mixing 44 0 mL of ethanol C H O and 56 0 mL of water Assuming ideal behavior what is the vapor pressure of the solution at 20 C The relevant values at 20 C are included in the table Liquid ethanol water vapor pressure Density g mL 0 789 0 998 Vapor Pressure P Torr 43 9 17 5 Torm

At 13 0 C a common temperature for household freezers what is the maximum mass of sucralose C12H19C1308 you can add to 2 50 kg of pure water and still have the solution freeze Assume that sucralose is a molecular solid and does not ionize when it dissolves in water Consult the table of Kf values mass of sucralose g

If a 0 590 m aqueous solution freezes at 3 10 C what is the van t Hoff factor i of the solute Consult the table of Kf values i

Imagine two solutions with the same concentration and the same boiling point but one has ethanol as the solvent and the other has carbon tetrachloride as the solvent Determine that molal concentration m or b and boiling point Th m m Solvent Tb ethanol carbon tetrachloride Normal boiling point C 784 76 8 K C m 1 22 5 03

Calculate the osmotic pressure of a 0 246 M aqueous solution of sucrose C 2H 2O11 at 37 C II atr

131 0 g of chlorine gas Cl and 38 0 g of helium He are mixed in a container with a total pressure of 1 719 mmHg Determine the partial pressure of helium gas Answer mmHg

In a 79 0 g aqueous solution of methanol CH O the mole fraction of methanol is 0 350 What is the mass of each component mass of CH O

A 1 145 g sample contains only vitamin C CH O and sucralose C 2H Cl30g When the sample is dissolved in water to a total volume of 37 3 mL the osmotic pressure of the solution is 3 45 atm at 285 K What is the mass percent of vitamin C and sucralose in the sample vitamin C of

A chemist combined chloroform CHC13 and acetone C3H O to create a solution where the mole fraction of chloroform Xchloroform is 0 171 The densities of chloroform and acetone are 1 48 g mL and 0 791 g mL respectively Calculate the molarity of the solution Assume the volumes are additive molarity Calculate the molality of the solution

Calculate the molality of a solution formed by adding 3 60 g NH4Cl to 13 7 g of water 2 50

What is the mole fraction X of solute and the molality m or b for an aqueous solution that is 19 0 NaOH by mass X Attempt 4 0 090

Calculate the molar concentration for TWO of the following select one from a b and one from c d only Remember to show all work and put final answer in significant digits From a b I have selected From c d I have selected a 0 35 mol of LiCl in 375 mL b 6 34 mol of potassium sulfate in 2 55 L c 18 75 g of NaOH in 1 72L d 22 8 g of lead II chlorate in 38 4 mL

3 Weak acids and bases partially in water Strong acids and bases 4 Consider a dilute solution of 0 025 M LIOH in answering the following questions a What is the OH in this solution Explain your answer b What is the pH of this solution in water

How many mL of 3 00 M HCI solution is needed to prepare 447 8 mL of 0 588 M solution

Complete the following calculations and show all of your work 20 What is the molarity of a solution that contains 6 moles of solute in 2 liters of solution 21 An NaOH solution contains 2 6 grams of NaOH and its concentration is 1 3 M What is its volume

Question 8 How many mL of 1 51 M CaCl2 have 10 41 g of CaCl2 in them Question 9 What is the molarity of a solution that has 50 grams of NaCl in 150 ml of solution

O 9 0 4 5 O 10 1 O 5 7 Question 10 5 pts How many grams of aluminum oxide are produced according to the reaction below given that you start with 11 8 grams of Al and 11 8 grams of O2

The pH scale measures the acidity of a liquid as a function of its hydrogen ion pH log H A chemist needs to prepare a solution with a pH of 3 What H concentration should the solution have OA 1 000 O B 100 OC 0 01 H concentration O D 0 001

A hospital laboratory needs a 11 hydrogen chloride solution However only 6 and 19 HCI solutions are in stock How much of the 6 solution should be mixed with 800 fl oz of the 19 solution to get a 11 solution