Calculate the theoretical yield of aspirin a) in moles and b) in grams. Assume use of 1.0 g salicylic acid and 2.5 mL acetic anhydride. Show all calculations.
In: Chemistry
Part A -
Bovine Insulin
An aqueous solution containing 1.0 g/liter of bovine insulin (a protein not ionized) has an osmotic pressure of 3.1 mm Hg at 25
In: Chemistry
In a 1.0× 10–4 M solution of HClO(aq), identify the relative molar amounts of these species from least to most. HNO3, OH^-,H3O^+,NO3^-,H2O
In: Chemistry
Calculate the maximum mass (in grams) of the following metal sulfides that can be dissolved in 1.0 L of a solution that is 4.90×10−5 M in Na2S.
A. PbS
B. ZnS
In: Chemistry
From our bottle of wine; 3x 100 mL sample replicates were produced and the pH adjusted to pH 7.9 by addition of 4.0 mL of NH4OH (0.5 M) with phosphate buffer. The solution was then coloured with 1.0 mL of 2% (w/v) dye solution and 1.0 mL of 8% (w/v) K3Fe(CN)6 solution. The resulting solutions were left to stand for 15 minutes for colour development.
(v) This reaction is analogous to that shown in the lecture notes, yielding identical products. If phenol compounds are oxidised… what reagent is reduced? Write a generalised equation for this reaction. What is the role of the Fe3+ complex?
In: Chemistry
A study was conducted on a sample randomly selected from city A. The results are presented in
the table. Based on the information in the table answer the below questions:
Age groups Number of participants Proportion of female Relative frequency of
participants
15 years or younger 10 0.4
16-25 years 25 0.6
26-30 years 10 1.0
31 years or older 2 1.0
Are the age groups mutually exclusive?
Based on the number of participants, can you argue for or against this sample being
representative of the age groups in city A?
How many males and females were included in the study?
Calculate the relative frequencies in the first right column.
In: Statistics and Probability
A galvanic (voltaic) cell consists of an electrode composed of nickel in a 1.0 M nickel(II) ion solution and another electrode composed of gold in a 1.0 M gold(III) ion solution, connected by a salt bridge. Calculate the standard potential for this cell at 25 °C.
____V
2)Consider these two entries from a fictional table of standard
reduction potentials.
X2+ + 2e- => X(s) E=2.26 V
Y2+ + 2e- => Y(s) E=0.14 V
Which pair of species would react under standard conditions?
_X2+ and Y
_X2+ and Y2+
_X and Y
_X and Y2+
In: Chemistry
3. Assume you had two stocks. Stock A had an expected return of 20% and a standard deviation of 25%. Stock B had an expected return of 15% and a standard deviation of 20%. You want to create a portfolio made up of 65% stock A and 35% stock B. Find the expected return and standard deviation of this portfolio under the following conditions
3a. Correlation between stock A and B is 1.0
3b. Correlation between stock A and B is 0.5
3c. Correlation between stock A and B is 0.0
3d. Correlation between stock A and B is -0.5
3e. Correlation between stock A and B is -1.0
In: Finance
Given four beakers labeled A, B, C, and D.
Add 40 mL of distilled water to beakers A and C.
Add 40 mL of the prepared sodium acetate/acetic acid buffer solution to both beakers B and D.
Pipette 1.0 mL of 6 M HCl, hydrochloric acid solution into beakers A and B.
Pipette 1.0 mL of 6 M NaOH, sodium hydroxide solution into beakers C and D.
If the concentration of CH3CO2Na after dilution is 0.62M and the concentration of CH3CO2H after dilution is 0.51M
Calculated pH of beaker A and B after the addition of 6 M HCl.(Ka of CH3CO2H=1.32x10^-4)
In: Chemistry
|
Station |
Task Assigned |
Task Time (minutes) |
|
1 |
1 |
3.0 |
|
2 |
3; 4 |
1.5; 2.0 |
|
3 |
2; 5; 6 |
1.5; 1.5; 2.0 |
|
4 |
7 |
3.0 |
|
5 |
8 |
2.5 |
|
6 |
9; 10; 11 |
2.0; 1.0; 1.0 |
(a) What is the assigned cycle time (in minutes)?
(b) What is the maximum output rate of this line in mixers per hour?
(c) What is the total idle time per cycle?
(d) What is the assembly line's efficiency?
In: Finance