In a random sample of 29 residents of the state of Montana, the mean waste recycled per person per day was 1.0 pounds with a standard deviation of 0.57 pounds. Determine the 95% confidence interval for the mean waste recycled per person per day for the population of Montana. Assume the population is approximately normal. Step 1 of 2: Find the critical value that should be used in constructing the confidence interval. Round your answer to three decimal places.

What is the equilibrium concentration of ammonium ion in a 0.33 M solution of ammonia (NH3, Kb = 1.8 × 10–5) at 25oC?

An initially 1.0 M aqueous solution of a weak monoprotic acid has a total ion concentration of M when equilibrium is established.

What is the acid-ionization constant, Ka, of the weak acid? (assume Ca/Ka ≥ 102) For the reaction ΔG°700K = –13.457 kJ. What is Kp for this reaction at 700. K?

The table below gives the amount invested and betas for three stocks.

Stock      Amount Invested          Beta

GM            K10, 000                      1.2

IBM           K10, 000                      1.0

WMT        K20, 000                      0.7

REQUIRED:

1. Using the CAPM, if the expected return for the market is 6% and the risk-free rate is 1.5%, what is the expected return for each stock?   
2. What is the beta for this portfolio based on the invested amounts?
3. Using the CAPM, what is the expected return for this portfolio?       

(A) Your whole cell lysate sample gives an absorbance reading of 15 when undiluted. What dilution would be necessary to get the absorbance down to 0.5?

(B) You want a total whole cell lysate sample volume of 1.0 mL to retest its absorbance. Using the dilution factor you determine in part (A), what volume of the whole cell lysate sample and what volume of buffer would you use to make the dilution?

A battery is constructed based on the oxidation of magnesium and the reduction of Cu2+. The initial concentrations of Mg2+ and Cu2+ are 1.2×10⁻⁴ M and 1.5 M , respectively, in 1.0-liter half-cells.

A)What is the initial voltage of the battery?   

B)What is the voltage of the battery after delivering 5.0 A for 8.0 h ?

C) What are the concentrations of Mg²⁺ and Cu²⁺ when the cell is dead?

D)  How long can the battery deliver 5.0 A before going dead?

1. NO₂ (g) + OH• (g)à HNO₃ (g)

The rate constant for this reaction is 1.2x10^-11 cm³ molecule^-1s^-1.

• Write the rate law for this reaction.
• hydroxyl radical concentration in atmosphere is 2.0 x10⁶ molecules cm^-3 at 25 ^oC, find the atmospheric lifetime of NO₂ at 25 ^oC (in hours)
• Use the information from first second , determine the concentration of hydroxyl radicals in ppbv at 25 ^oC and 1.0 atm.

Thickness measurements of ancient prehistoric Native American pot shards discovered in a Hopi village are approximately normally distributed, with a mean of 4.5 millimeters (mm) and a standard deviation of 1.0 mm. For a randomly found shard, find the following probabilities. (Round your answers to four decimal places.)

(a) the thickness is less than 3.0 mm


(b) the thickness is more than 7.0 mm


(c) the thickness is between 3.0 mm and 7.0 mm

Zinc (Zn) metal reacts with hydrochloric acid (HCl) according to the following reaction: Zn(s) + 2 HCl(aq) ZnCl2(aq) + H2(g)What volume of H2 gas would be collected over water if 6.93 g Zn metal were allowed to react with 25.0 mL of 1.0 M HCl at 25.0 oC? The vapour pressure of water at 25.0 oC is 23.8 torr, and the pressure of the laboratory is 1.00 atm

Fluoride, in the form of sodium silicofluoride (Na2SiF6), is commonly added to municipal drinking water to prevent tooth decay. It is generally added at a level of 1.0 mg/L, but its maximum concentration level (MCL) cannot exceed 4.0 mg/L. You have been assigned to prepare a liter of a standard solution that contains 1.000 mg/L fluoride. a. Which balance in your lab would you use to prepare the solution? Explain why.