For the next three problems, consider 1.0 L of a solution which is 0.6 M HC2H3O2 and 0.2 M NaC2H3O2 (Ka for HC2H3O2 = 1.8 x 10-5). Assume 2 significant figures in all of the given concentrations so that you should calculate all of the following pH values to two decimal places.
1. Calculate the pH of this solution.
2. Calculate the pH after 0.10 mol of HCl has been added to the
original solution. Assume no volume change on addition of
HCl.
3. Calculate the pH after 0.20 mol of NaOH has been added to the
original buffer solution. Assume no volume change on addition of
NaOH.
In: Chemistry
Which of the following compounds, when added to a 1.0-M solution of HClO4, has a solubility greater than in pure water? Select all that apply.
Group of answer choices
Cr(ClO4)3
Ca3(PO4)2
PbI2
ZnS
AgBr
BaF2
In: Chemistry
A hydrogen-rich gas stream contains 1.0 mole % carbon monoxide. It is desired to use a microporous ceramic membrane for separating carbon monoxide (CO) from hydrogen gas at a pressure of 1 atm and a temperature of 400C. The average pore diameter of the membrane is 15 nm and the void fraction is 0.30.
a) Estimate the molecular diffusivity of CO in a mixture with H2
b) Determine the Knudsen diffusion coefficient and the effective diffusion coefficient for CO in the membrane
In: Physics
A 15.0-L tank containing 1.0 mol of argon gas is at 298 K.
(a) Calculate the initial pressure of the gas and d, the length of the cube containing this volume.
(b) Using your value for d, calculate the energies of the two lowest translational energies for the system E1,1,1 and E2,1,1 and their differences ΔE .
(c) The tank is opened and the gas is allowed to expand rapidly into a cubical 2000L room such that there is no heat exchange with the surrounding.
Assuming n2,1,1/n1,1,1 remains constant, Determine the new temperature of the gas.
Handwritten answers are preferred.
In: Physics
A radio antenna broadcasts a 1.0 MHz radio wave with 29.0 kW of power. Assume that the radiation is emitted uniformly in all directions.
What is the wave's intensity 25.0 km from the antenna?
The answer is 3.69×10−6 W/m^2
What is the electric field amplitude at this distance?
In: Physics
When 100 mL of an aqueous solution containing 1.0 g of caffeine is extracted with 10 mL of chloroform at room temperature, 0.5 g of caffeine is transferred to the chloroform layer. Calculate the distribution coefficient of caffeine between chloroform and water at room temperature.
In: Chemistry
A 1.0 m3 tank, initially filled with 103. kPa, 300. K air, is connected to a source of air at 1,500. kPa, 300. K. The tank slowly fills until it is at the same pressure. If the temperature is maintained at 300. K throughout this transient process, what is the total heat transfer required? (You can assume air is an ideal gas.)
In: Chemistry
(a) The cell of interest in this figure is: Cu(s) | CuSO4(aq, 1.0 M) | KCl(aq, 3 M) | AgCl(s) | Ag(s) Write reduction half-reactions for this cell. (Omit states-of-matter from your answer.)
In: Chemistry
You are managing a portfolio of $1.0 million. Your target
duration is 18 years, and you can choose from two bonds: a
zero-coupon bond with maturity five years, and a perpetuity, each
currently yielding 4%.
a. How much of (i) the zero-coupon bond
and (ii) the perpetuity will you hold in your portfolio?
(Do not round intermediate calculations.
Round your answers to 2 decimal places.)
b. How will these fractions change next
year if target duration is now seventeen years?
(Do not round intermediate calculations. Round your answers
to 2 decimal places.)
In: Finance
WBS Exercise
The Fence – Statement of Work
1.0 Backyard
1.1 Each side of the yard (east & west) run 75’ deep
1.2 Width of the backyard is 82.5’
2.0 Wood Fencing
2.1 All wood; earth tone brown stain
2.2 Shadowbox style
2.3 6’ at peak of arches
3.0 Support Studs and rails
3.1 7.5’ between support studs
3.2 Corner support studs (6) are 6”x6”,
3.3 Non‐corner support studs are 4”x4”
3.4 All support studs will be sunk 18” below ground and concrete reinforced
3.5 Two rails will connect between studs
3.6 Rails and supports studs will be all wood; earth tone brown stain
4.0 Gates
4.1 Two gates will exist on either side of the house extending out 12.5’ on each side
4.2 Gates will also be all wood; earth tone brown stain
4.3 Shadow box style
4.4 Continuing in line with 6’ arches o f fence
In: Operations Management