Calculate the pH of 1.0 L upon addition of 0.190 mol of solid NaOH to the original buffer solution. Express the pH to two decimal places. Consider a buffer solution that is 0.50 M in NH3 and 0.20 M in NH4Cl. For ammonia, pKb=4.75.

A 1.0 L of a buffer solution is created which is 0.363 M in hydrocyanic acid, HCN, and 0.303 M sodium cyanate, NaCN. K_a for HCN = 4.0 x 10^-10.

What is the pH after 0.089 mol of HCl is added to the buffer solution?

A spherical thermocouple junction 1.0 mm in diameter is inserted in a combustion chamber to measure the temperature ?T? of the products of combustion. The hot gases have a velocity of V= 5 m/s. (a) If the thermocouple is at room temperature, Ti,when it is inserted in the chamber, estimate the time required for the temperature difference, ?T?-T, to reach 2% of the initial temperature difference, ?T?-Ti. Neglect radiation and conduction through the leads. Properties of the thermocouple junction are approximated as k= 100 W/m·K, c=385 J/kg·K, and ?=8920 kg/m³, while those of the combustion gases may be approximated as k=0.05 W/m·K, ?=50 x 10^-6 m²/s, and Pr=0.69.

(b) If the thermocouple junction has an emissivity of 0.1 and the cooled walls of the combustor are at Tc=400 K, what is the steady-state temperature of the thermocouple junction if the combustion gases are at 1000 K? Conduction through the lead wires may be neglected.

Assuming that the gas properties are constant, what is the value of the Nusselt number?

What is the average convection heat transfer coefficient for the gas flowing over the thermocouple, in W/m²·K?

What is the Biot number for this problem?

How long does it take for the temperature difference (?T?-T) to get within 2% of the initial temperature difference (?T?-Ti), in s?

What is the final steady state temperature of the thermocouple, in K, if the combustion gases are at 1000 K?

What is the ph of a solution made from 500 mL of 1.0 M HC2H3O2 and 1000 mL of .5 M C2H3O- after 80 mL 0.9 M NaOh has been added?

If Compound A (256 mg) was hydrolyzed using 12.5 mL of 1.0 M KOH and the amount of remaining KOH was back titrated and required 44.9 mL of 0.25 M HCL to neutralize the excess NaOH, what were the saponification equivalent and neutralization equivalent, and what is compound A?

A certain material's temperature increases by 1.0 C for every 1560J that it gains. A 0.1964g sample of quinone (molar mass= 108.1 g/mol) was burnt, and the surrounding material's temperature increased from 20.3C to 23.5C. Find the molar heat of reaction for the combustion of quinone.

Part A) A sample of a gas at 25°C and 1.0 atm pressure has a volume of 2.5 L. The container is allowed to expand until the pressure is 0.85 atm and the temperature is 15°C. The final volume of the gas is __________ L.

Part B) A reaction is carried out that produces hydrogen gas. The gas is collected in an inverted beaker over water at 25 ^oC. The vapor pressure of water at 25 ^oC is 23.78 mmHg. The total pressure in the beaker is determined to be 755.3 torr. What is the partial pressure (in units of torr) of the hydrogen gas in the beaker?

Part C) CH₃SH gas and NH₃ gas both have strong distinctive odors. If containers of each of these two gases are opened at the front of a room at the same time, which one will be smelled first by the people sitting in back of the room?

A.		CH3SH
B.		NH3
C.		Since they are ate the same temperature they will both diffuse at the same rate so will be smelled at the same time.
D.		Neither will diffuse to the back of the room so they will not be smelled by the people in the back of the room.

Suppose that the S&P 500, with a beta of 1.0, has an expected return of 11% and T-bills provide a risk-free return of 6%.

a. What would be the expected return and beta of portfolios constructed from these two assets with weights in the S&P 500 of (i) 0; (ii) 0.25; (iii) 0.50; (iv) 0.75; (v) 1.0? (Leave no cells blank - be certain to enter "0" wherever required. Do not round intermediate calculations. Enter the value of Expected return as a percentage rounded to 2 decimal places and value of Beta rounded to 2 decimal places.)

		Expected Return	Beta
(i)	0
(ii)	0.25
(iii)	0.5
(iv)	0.75
(v)	1

A 1.0 M solution of a compound with 2 ionizable groups (pKa's = 6.2 and 9.5; 100 mL total) has a pH of 6.8. What are the concentrations of the relevant acid and conjugate base?

A solution of HCl is prepared by diluting 25.0 mL of a 1.0 M HCl solution with enough water to make 750 mL of HCl solution. (Show your work for all calculations!)

a) What is the molarity of the HCl solution?

b) What is the [H3O+] and the pH of the HCl solution?

c) Write the balanced chemical equation for the reaction of HCl and Ba(OH)2

d) How many milliliters of the diluted HCl solution is required to completely react with 350 mg of Ba(OH)2?