In the Dumas Method for determining the molar mass of an unknown liquid with a boiling point less than water, the liquid is vaporized in a bulb (whose volume is precisely known) that is immerse in a water bath. The bulb is sealed after all the liquid has been evaporated. The bulb is cooled and the gas that has filled the container condenses. The bulb is weighed and the weight of the liquid in the bulb is determined by weighing the bulb before the experiment and after the experiment. The following data for an unknown liquid is obtained using the Dumas Method:

The gas in the Dumas bulb must be

Firm L has $500,000 to invest and is considering two alternatives. Investment A would pay 6 percent ($30,000 annual before-tax cash flow). Investment B would pay 4.8 percent ($24,000 annual before-tax cash flow). The return on Investment A is taxable, while the return on Investment B is tax exempt. Firm L forecasts that its 21 percent marginal tax rate will be stable for the foreseeable future.

Required:

1. a. Compute the explicit tax and implicit tax that Firm L will pay with respect to Investment A and Investment B.
2. b-1. What is the annual after-tax cash flow for Investment A?
3. b-2. What is the annual after-tax cash flow for Investment B?
4. b-3. Which investment results in the greater annual after-tax cash flow?

Simple harmonic motion:

A ball dropped from a height of 4.00m makes an elastic collision with the ground in a vacuum chamber. a) What is the difference between the kinetic energy of the ball immediately before the collision and the kinetic energy of the ball immediately after the collision? b) Is the kinetic energy of the ball conserved in its subsequent motion after the collision? c) What is the difference between the momentum of the ball immediately before the collision and the momentum of the ball immediately after the collision? d) Is the total momentum of the system conserved, and if so, what other parts of the system must be included other than the ball? e) Identify an equilibrium point for the entire system. Explain why the motion around this equilibrium point is periodic and determine the period of the motion. f) Is the motion simple harmonic motion? Explain.

Having problem solving this..

A city wants to know if a new advertising campaign to make citizens aware of the dangers of driving after drinking has been effective. The accompanying table shows the number of drivers who have been stopped with more alcohol in their systems than the law allows for each day of the week in the week before and the week a month after the campaign starts. Assume that the data from each population is Normally distributed. Complete parts a through i below.

A) Compute the standard deviation of the differences

B) Compute the standard deviation of the differences

C) Find the value of the t-statistic.

Firm L has $500,000 to invest and is considering two alternatives. Investment A would pay 6 percent ($30,000 annual before-tax cash flow). Investment B would pay 4.5 percent ($22,500 annual before-tax cash flow). The return on Investment A is taxable, whereas the return on Investment B is tax exempt. Firm L forecasts that its 35 percent marginal tax rate will be stable for the foreseeable future.

a. Compute the explicit tax and implicit tax that Firm L will pay with respect to Investment A and Investment B.

b-1. What is the annual after-tax cash flow for Investment A?

b-2. What is the annual after-tax cash flow for Investment B?

b-3. Which investment results in the greater annual after-tax cash flow?

Question: 9 hypertension patients in a clinic use an experimental drug for treatment. The systolic blood pressure reading for these patients before and after using the drug are as follows:

Assume that blood pressure has a standard deviation of 5 mmHg. Do you think the drug works?

After solving the problem;

1-) Choose the treshold value on your own.

2-) Explain briefly why you choose that numbers as treshold

3-) Make comments on the result of hypothesis test.

Thank you for everything.

You are trying to establish the IgG response from a recently vaccinated individual, where it will be important to know how much IgG they have both before and after the vaccination. You start with two samples of 8 mL of blood, one from before vaccination and one after. You use an affinity chromatography technique to remove just the IgG (ε = 1.35 g-1L cm-1). You end with a 2 mL sample of each. The pre-vaccinated sample has an A280 reading of 0.85, and the post-vaccinated sample has an A280 reading of 0.202 with a 10-fold dilution (both with a 1 cm path length).

a) How many micrograms of IgG were in each of the original blood samples?

b) What fold change in IgG amounts was seen after vaccination?

Answer the following 5 questions in 250 words or more. Be detailed and give examples when possible.

-Explain Oracle's top ten recommendations to encourage and accelerate innovation. Do you agree or disagree with any of their recommendations, Why?

-What is the Poverty Trap? What are the major issues the government faces when dealing with problem?

Calculate the pH for each of the following cases in the titration of 25.0 mL of 0.120 M pyridine, C5H5N(aq) with 0.120 M HBr(aq):

Kb= 1.7x10^-7, so Ka must equal 5.88x10^-24

(a) before addition of any HBr, pH=?

(b) after the addition of 12.5mL of HBr, pH=?

(c) after the addition of 24.0mL of HBr, pH=?

(d) after addition of 25.0mL of HBr, pH=?

(e) after addition of 34.0mL of HBr, pH=?