Using Ka values given in your textbook, design a buffered solution whose pH is 4.50.

a) what acid and salt will you use to make this buffer?

b) if you start with 0.20M solution of the weak acid, what inital concentration of the salt is needed?

c) how many grams of th salt would be needed to make 1.000 L of the buffer solution?

A new manufacturing plant costs $5,150,000 to build. Operating and maintenance costs are estimated to be $43,000 per year, and a salvage value of 25% of the initial cost is expected. The units the plant produces are sold for $35 each. Sales and production are designed to run 365 days per year. The planning horizon is 10 years. Find the break-even value for the number of units sold per day for each of the following values of MARR:

A/ 5%

Break-even value:   units

Carry all interim calculations to 5 decimal places and then round your final answer up to the nearest unit. The tolerance is ±1.

B/ 10%

Break-even value:   units

Carry all interim calculations to 5 decimal places and then round your final answer up to the nearest unit. The tolerance is ±1.

C/ 15%

Break-even value:   units

Carry all interim calculations to 5 decimal places and then round your final answer up to the nearest unit. The tolerance is ±1.

USE C++: Encryption and Decryption are two cryptographic techniques. Encryption is used to transform text to meaningless characters, and decryption is used to transform meaningless characters into meaningful text. The algorithm that does the encryption is called a cipher. A simple encryption algorithm is Caesar cipher, which works as follows: replace each clear text letter with a letter chosen to be n places later in the alphabet. The number of places, n, is called the cipher key. For example, if the cipher key is 3, the clear text“HELLO THERE” becomes “KHOOR WKHUH”.Here, we restrict ourselves to encrypting/decrypting digits (0...9), lowercase, and uppercase alphabetic characters. As you know from the ASCII table, the set of these characters correspond to the integers 48to 122.Hint: The following formula can be used to encrypt a character C using the Caesar cipher algorithm: E = (C –‘0’ + k) % 75+ ‘0’ [where k is the cipher key]You need to figure out the formula for decrypting text on your own.NOTE: Use cipher key = 7.Write a C++ program for encrypting and decrypting a given string. Since this program performs two different functionalities (encryption and decryption), prompt the user to select the type of cryptographic technique as shown below: Welcome to Cryptographic Techniques ProgramPlease enter your selection:1. Encrypt2. DecryptWhen the user selects 1 or 2, s/he will be asked to specify an input and output message. Here is an example: Assume that the user enters the following message: HOW ARE YOU DOING? If the user selects to encrypt the message (i.e. option 1), the program will encrypt the original message and outputs an encrypted text. If the user selects to decrypt a message (i.e. option 2), the program will decrypt the encrypted text and outputs the decrypted text on the screen. The program should give the user the option of whether to continue with encrypting/decrypting messages (i.e. entering the letter ‘C’) or exit the program (i.e. entering the letter‘E’).

A Compartment A holds helium at pressure 5 atm, and compartment B holds argon at pressure 10atm. the partition between the gases is removed and the gases are allowed to mix. The mole fraction of helium in the mixture is 0.40 and the total volume of both compartments is 30.0 L . Temperature of helium and argon before and after mixing was 500K. Find volume of compartment A and B.

3. What is resource leveling and what might be the benefits to the project of being able to resource level?

4. List and describe the key elements of an e effective group?

A psychology professor assigns letter grades on a test according to the following scheme. A: Top 10% of scores B: Scores below the top 10% and above the bottom 65% C: Scores below the top 35% and above the bottom 25% D: Scores below the top 75% and above the bottom 9% F: Bottom 9% of scores Scores on the test are normally distributed with a mean of 66.9 and a standard deviation of 9. Find the numerical limits for a D grade. Round your answers to the nearest whole number, if necessary.

using a buret, add 1, 5, 10, and 15mL of standardized 0.0024 M K2CrO4 to each of four clean, dry 100-mL volumetric flasks and dilute to the 100 mL mark with 0.25 M NaNO3. Calculate the CrO4 2- concentration in each of these flasks

A racecar of mass 500 kg is going around a curve of radius 15.0 m, banked at 45∘ . The car has a coefficient of static friction with the track which is 0.200. The car also has a rear wing which produces downforce—“negative lift” due to airflow over the wing, which pushes the car into the track. The downforce is given by ? = ?v² , where ? = 10 kg/m. Find the minimum and maximum speeds between which the car can take the curve without skidding.

Answer the following questions on price elasticity of demand.

Describe with example learning organisations processes which know Single-Loop and Double-Loop?
Single-Loop:
Double-Loop:

explain in the Fortran 77 code performance evaluation of evaporative cooler with corrugated fins and spherical fins...

mention it's parameter in Fortran 77 and plot graph using fortran 77

skip it.....if u can't answer it.....

The following table provides two risky assets for you to construct the investment opportunity sets based on the given correlation information.

Constructing investment opportunity sets

Complete the table of Risks and Returns of all the possible combinations.

For each correlation situation, insert a “Mean-Standard Deviation” chart and plotting the investment opportunity sets with varying weights on the two risky assets, then connecting the dots to show the curvature of each investment set.

Given a risk-free of 3%, draw a capital allocation line (CAL) to connect the risk-free rate and the “optimal portfolio” point on each curvature chart.

Please complete on excel and show work

Visualize the initially empty myHeap after the following sequence of operations
o myHeap.add(2)
o myHeap.add(3)
o myHeap.add(4)
o myHeap.add(1)
o myHeap.add(9)
o myHeap.remove()
o myHeap.add(7)
o myHeap.add(6)
o myHeap.remove()
o myHeap.add(5)

do you think economists should alter the way they model firm behavior? In other words, do you think it’s accurate to model firm’s behavior with the assumption that firm’s primary objective is to maximize profit? Explain your answer