10B When you need to produce a variety of diluted solutions of a solute, you can dilute a series of stock solutions. A stock solution has a significantly higher concentration of the given solute (typically 101 to 104 times higher than those of the diluted solutions). The high concentration allows many diluted solutions to be prepared using minimal amounts of the stock solution.

What volume of a 6.31  M stock solution do you need to prepare 100.  mL of a 0.2227  M solution of HNO3?

Express the volume to three significant figures with the appropriate units.

10C The absorbance of a cationic iron(II) sample solution was measured in a spectrophotometer, but the instrument returned an error because the absorbance was too high. The sample was then diluted by using a pipette to take 100.0 μL of the sample and injecting it into a cuvette already containing 2.00 mL of water (total volume is 2.00 mL + 100.0 μL). The absorbance value of the diluted solution corresponded to a concentration of 5.92×10⁻⁶  M . What was the concentration of the original solution?

Express the concentration to three significant figures with the appropriate units.

11A The absorbance of a cationic iron(II) sample solution was measured in a spectrophotometer, but the instrument returned an error because the absorbance was too high. The sample was then diluted by using a pipette to take 100.0 μL of the sample and injecting it into a cuvette already containing 2.00 mL of water (total volume is 2.00 mL + 100.0 μL). The absorbance value of the diluted solution corresponded to a concentration of 5.92×10⁻⁶  M . What was the concentration of the original solution?

Express the concentration to three significant figures with the appropriate units.

11B A 429-mL sample of unknown HCl solution reacts completely with Na2CO3 to form 18.1 g CO2. What was the concentration of the HCl solution?

Choose two business or political leaders, one who has used the Mirror and Window correctly in dealing with the COVID-19 crisis and one who has used them incorrectly and justify your answers.

Balance the following electrochemical reaction in an acidic solution:

CrO4^- +S^2- > Cr^3 +(SO4)^2-

Explain or define the following terms:

a) molar absorptivity

b) path length

c) ligand

Ammonia gas, NH3 (g) can be synthesized via the reaction:

2 NO (g) + 5 H₂ (g) -> 2 NH₃ (g) + 2 H₂O (g)

Suppose you start with a 45.8 g of NO and 12.4 g of H₂. Determine the limiting reactant and give the theoretical yield of ammonia, in grams. The molar mass of NO is 30.01 g/mol, and the molar mass of H₂ is 2.02 g/mol.

the causes and consequences of that hyperinflation, and then state whether you think what occurred in Germany then could ever happen in the U.S. Support your point of view with cited, credible evidence and carefully considered arguments.

3. You would like to retire at the end of 40 years with an annual pension of $1 million per year for 30 years.

a) How much would you have to deposit every year for the next 40 years to meet your goal? Assume you invest in the stock market at an average return of 12 percent per year (for the entire 70 years).

b) Suppose your annual deposits calculated in part (a) actually earned only 6 percent per year for 40 years, how much would you be able to withdraw every year for 30 years following retirement? Assume the 6 percent return is earned over the entire 70 years.

should companies report cybersecurity incidents or not? Is any policy needed around cybersecurity? Why?

Bixby Carpet Manufacturing Inc. uses a process costing system and calculates per-unit costs using the weighted average method. The following data relates to the first production department (the Weaving Department) of its Rayon carpet brand for the month of November.
Beginning Work in Process Inventory: 600 units, 40% complete Ending Work in Process Inventory: 800 units, 50% complete Units started: 10,400 units
All direct materials are added at the beginning of the process, and conversion costs are assumed to be incurred uniformly throughout. The cost of direct materials in beginning Work in Process Inventory was $42,000, and conversion costs in beginning Work in Process were $10,600.
During the month, $220,000 of direct materials were added to production. Direct labor for the period was $46,000 and manufacturing overhead was $17,600. Over the course of the month, 5,100 units were completed and transferred out of the Weaving Department to the Finishing Department.
The total conversion costs assigned to the units transferred out is

1. The formation of silver hydroxide, AgOH (s), is a precipitation reaction used to remove silver from water originated from industries of photographic material processing. Similar reactions are used to remove other heavy metals in water. The pKs of the relevant reaction shown below is 7.7 at 25 °C.

AgOH (s) ↔ Ag⁺ + OH^-

If the pH of a specific wastewater is initially 6.5 and after treatment is 10.0, what is the maximum concentration of soluble Ag⁺ in mg/L a) prior and b) after treatment? c) Is pH 13 enough to reduce silver concentrations to Secondary MCL (maximum contaminant level) of 0.1 mg/L?

Data:

1) Atomic weight: Ag=107.87 g/mole; O=16.00 g/mole; H=1.01 g/mole;

2) Assume that any other compounds or metals in this wastewater do not influence this solubility reaction.

3) The temperature of the wastewater is 25 ºC.

PLEASE SOLVE ALL PARTS AND EXPLAIN IN DETAIL.

I'M HAVING A DIFFICULT TIME UNDERSTANDING HOW TO FIND/SOLVE THESE TYPES OF PROBLEMS:

In 2017, as reported by ACT Research Service, the mean ACT Math score was μ=20.6 μ=20.6 . ACT Math scores are normally distributed with σ=4.8 σ=4.8 .

1. What is the probability that a randomly selected test taker has an ACT Math score less than 18? Is this result unusual? Explain.
2. Describe the sampling distribution of x ˆ  x^ , the sample mean ACT Math score for a random sample of 40 tests using the N(mean, standard deviation) notation.
3. What is the probability that a random sample of 40 tests has a mean ACT Math score less than 18? Is this result unusual? Explain.
4. What is the difference in part a and c in this question?

For each of the six business environments, identify at least one potential problem that your business may face. Explain this problem in one or two sentences.

PLEASE MAKE COPY PASTE AVAILABLE

Highlights the different models used for SMEs transactions, and discuss differences between the models and General Accepted Accounting Principles (GAAP).