Question

1) Use Henry's law to determine the molar solubility of helium at a pressure of 1.9...

1) Use Henry's law to determine the molar solubility of helium at a pressure of 1.9 atm and 25 ∘C. Henry’s law constant for helium gas in water at 25 ∘C is 3.70⋅10−4M/atm.

2) A 2.800×10−2M solution of NaCl in water is at 20.0∘C. The sample was created by dissolving a sample of NaCl in water and then bringing the volume up to 1.000 L. It was determined that the volume of water needed to do this was 999.2 mL . The density of water at 20.0∘C is 0.9982 g/mL.

Calculate the molality of the salt solution.

Calculate the mole fraction of salt in this solution.

Calculate the concentration of the salt solution in percent by mass.

3)How much dry solute would you take to prepare each of the following solutions from the dry solute and the solvent?

b)120 g of 0.200 m NaNO3

c)120 g of 1.4 % NaNO3 solution by mass

d) How much solvent would you take to prepare the solution in part B?

e)How much solvent would you take to prepare the solution in part C?

4) The Safe Drinking Water Act (SDWA) sets a limit for mercury-a toxin to the central nervous system-at 0.002

ppm by mass. Water suppliers must periodically test their water to ensure that mercury levels do not exceed this limit. Suppose water becomes contaminated with mercury at twice the legal limit (0.004 ppm).

How much of this water would have to be consumed for someone to ingest 50 mg of mercury?

5)A solution contains a mixture of pentane and hexane at room temperature. The solution has a vapor pressure of 252

torr . Pure pentane and hexane have vapor pressures of 425 torr and 151 torr, respectively, at room temperature.

What is the mole fraction of hexane? (Assume ideal behavior.)

Homework Answers

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
a) Use Henry's law to determine the molar solubility of helium at a pressure of 1.8...
a) Use Henry's law to determine the molar solubility of helium at a pressure of 1.8 atm and 25 ∘C. Henry’s law constant for helium gas in water at 25 ∘C is 3.70⋅10−4M/atm. Express your answer using two significant figures. b) An aqueous solution containing 36.7 g  of an unknown molecular (non-electrolyte) compound in 160.0 g of water was found to have a freezing point of -1.5 ∘C. Calculate the molar mass of the unknown compound. Express your answer using two...
How much dry solute would you take to prepare each of the following solutions from the...
How much dry solute would you take to prepare each of the following solutions from the dry solute and the solvent? A.) 132 mL of 0.115 M NaNO3 B.) 124 g of 0.220 m NaNO3 C.) 124 g of 1.4 % NaNO3 solution by mass D.) How much solvent would you take to prepare the solution in part B? E.) How much solvent would you take to prepare the solution in part C?
How much dry solute would you take to prepare each of the following solutions from the...
How much dry solute would you take to prepare each of the following solutions from the dry solute and the solvent? A. 119 mL of 0.120 M NaNO3 B. 122 g of 0.220 m NaNO3 C. 122 g of 1.4 % NaNO3 solution by mass D. How much solvent would you take to prepare the solution in part B? E. How much solvent would you take to prepare the solution in part C?
Determine the molality of a solution of ethanol dissolved in methanol for which the mole fraction...
Determine the molality of a solution of ethanol dissolved in methanol for which the mole fraction of ethanol is 0.397. Give your answer to 2 decimal places Calculate the boiling point (in degrees C) of a solution made by dissolving 6.81 g of sucrose (C12H22O11) in 99.7 g of acetone. The Kbp of the solvent is 1.71 K/m and the normal boiling point is 56.2 degrees C. Give your answer to 2 decimal places When 11.8 g of an unknown,...
As solute is dissolved in a solvent, the vapor pressure of the solution changes according to...
As solute is dissolved in a solvent, the vapor pressure of the solution changes according to Raoult's law Psoln=Psolv×Xsolv where Psoln is the vapor pressure of the solution, Psolv is the vapor pressure of the pure solvent, and Xsolv is the mole fraction of the solvent. If the solute dissociates into ions, the term Xsolv must be modified to take into consideration the total number of moles of particles in the solution, both ions and molecules. When a solution contains...
1. The Henry's law constant for helium gas in water at 30 ∘C is 3.7×10−4M/atm; the...
1. The Henry's law constant for helium gas in water at 30 ∘C is 3.7×10−4M/atm; the constant for N2 at 30 ∘C is 6.0×10−4M/atm.    a. If helium gas is present at 2.1 atm pressure, calculate the solubility of this gas.    b. If N2 is present at 2.1 atm pressure, calculate the solubility of this gas. 2. A solution is made containing 14.7 g of CH3OH in 186 g H2O.    a. Calculate the mass percent of CH3OH.   ...
part a what is the molality of 3.00 g H2O2 in 97.00g of water? part b...
part a what is the molality of 3.00 g H2O2 in 97.00g of water? part b for the following reaction: 2NO(g)+2H2(g)-->N2 (g)+ 2H2O(g) if N2 is being produced at rate of 0.25 atm/min, at which rate is NO being used up? part c what will be the total pressure in a 3.00 L vessel containing 7.80 mol N2, 2.10 mol O2, and 0.10 Ar at 0.00 degree celsius? part d at standard temperature, a closed container of dry air contains...
Answer True and false 1.The solubility of gases is directly proportional to the temperature and the...
Answer True and false 1.The solubility of gases is directly proportional to the temperature and the partial pressure of the gas over solution 2. Raoult's Law (Psol=Psolv x Xsolv) indicates that when the mole fraction of the failure increase, vapor pressure of the solution increases. Please give answer for number 3 multiple choice. "What are the major solute-solvent interactions created when KBr dissolves in water." A) dipole- dipole, B) dispersion, C)hydrogen bonding , D)ion-dipole.
3. In a saturated solution of the ionic compound sodium sulfate, Na3PO4 all of the water...
3. In a saturated solution of the ionic compound sodium sulfate, Na3PO4 all of the water molecules are involved in the hydration process. some solid Na3PO4 is present. all of the above the concentration of Na+ is three times the concentration of PO43-. 4. A solution contains 85 grams sucrose and 100. grams of water. What is the mass percent of the sucrose solution? 5. A solution contains only glycerol and fructose. There is ten times as much glycerol as...
1) 362.11 g of O2 are contained in a 3.00 L high pressure tank at a...
1) 362.11 g of O2 are contained in a 3.00 L high pressure tank at a temperature of 186°C. What is the pressure of the gas in torr? 2) A gas has a given volume. The moles of gas are doubled then the pressure is 1/3 of the original pressure. After the pressure change, the Kelvin temperature quadruples (increases 4 times of the original Kelvin temperature). By how much has the volume changed? Be specific (i.e. the volume is 1/3...