Homework Statement
If you dissolve 9 g of urea (60.06 g/mol) in 10 mL of water, what is the vapor pressure of the solution at 24 C? Assume the density of water is 1.00 g/mL and the vapor pressure of pure water at 24 C is 22.4 mmHg.
Homework Equations
Henry's Law, maybe? I'm not sure...
Homework Statement
Wine that is 28.4% ethanol by wt is set outside. Will it freeze if the temp drops to -10 C? (assume water is the solvent)
Homework Equations
\DeltaTfp = kfp*molality of solute
The Attempt at a Solution
2.84 g of ethanol/10 g total =.284 mole
\DeltaTfp= -10 ?
Homework Statement
What mass of O2 can dissolve in 1L of water @ 25 C if the partial pressure of O2 is 40 mmHg?
Homework Equations
Henry's Law:
partial pressure = kH*concentration
kH of O2 = 769.2 L*atm/mol
The Attempt at a Solution
40 mmHg / 769.2 = concentration
Homework Statement
A 10% (by wt) solution of KNO3 would have what molality and what mole fraction
Homework Equations
mole fraction = moles of KNO3/total moles
wt % = # g of solute/total g
molality = # moles KNO3/kg H2O
The Attempt at a Solution
1 g KNO3/10 g total
1 g KNO3/101.1...
Homework Statement
Describe in detail how you would prepare 250 mL of a .25 molal solution of CaCl2
Homework Equations
CaCl2: 110.98 g/mol
molality = #moles of solute/kg of solvent
Homework Statement
Describe how you would prepare exactly 250 mL of .180 M K2S2O8 solution for use. Assume that you have a supply of solid K2S2O8, deionized water, a balance, and a volumetric flask. Also, how many grams of K2S2O8 would you need?
Homework Equations
The Attempt at a...
Homework Statement
Calculate the initial molarity of S2O32- in each trial given that each trial has 1.00 mL of .010 M Na2S2O3 and a total volume of 7.00 mL.
Homework Equations
mol = g/(g/mol)
M1V1=M2V2
The Attempt at a Solution
(1)(.01)=7x
.0014=x
Homework Statement...
Homework Statement
1) What are the units for the charge, Q?
2) What are the units for ke*Q?
3) What are the units for - ke*Q / R, R=radius (m)
4) What are the units for 2*ke*\lambda*ln R
5) What are the units for - 2*ke*\lambda
2. The attempt at a solution
1) C, Coulomb's
2) N*m2/C...
Homework Statement
Why is it necessary to report the temperature when reporting the rate constant?
Homework Equations
k*[A]^m*[B]^n
The Attempt at a Solution
Temperature, like the presence of a catalyst or the concentration of the substance, can have an effect on the reaction rate...
Homework Statement
Comment on the electric field lines of a pair of finite parallel plates (a) between the plates and (b) near the edges of the plates.
Homework Equations
The Attempt at a Solution
Homework Statement
How would static electricity on your clothes or on your body affect an experiment involving charged objects?
Homework Equations
Coulomb's Law
The Attempt at a Solution
The static electricity would attract the objects due to the like charges, assuming the objects...
Homework Statement
Corrected Angle, theta, vs Distance, r, demonstrate or relate to Coulomb's Law how?
Homework Equations
Coulomb's Law
The Attempt at a Solution
As the distance increases, the force decreases by a factor of 4 because "r" is squared in Coulomb's law.
Homework...