What mass of AgCl can be prepared by the reaction of 100.0 ml of 0.20 M aqueous AgNO3 with 100.0 ml of 0.15 M CaCl2? Write the molecular and net ionic equations.

Solve for the new pressure in each of the following, with n and V constant:

aA gas with a pressure of 1.25

atm at 60 ∘C is cooled to -24 ∘C.

b. A sample of

N2 with a pressure of 760 mmHg at -70 ∘C is heated to 34 ∘C.

A volume of 25.0mL of a 0.10M aqueous solution of acetic acid(HC₂H₃O₂ or HOAc or CH₃CO₂H, Ka=1.8x10^-5) is titrated with 0.080M NaOH.

What is the pH Initially

After 10.0mL of NaOH has been added

At the halfway point

After 20.0mL of NaOH has been added

At the equivalence point

And after 40.0mL NaOH has been added

Calculate the pH for each of the following cases in the titration of 25.0 mL of 0.100 M pyridine, C5H5N(aq) with 0.100 M HBr(aq):

(a) before addition of any HBr

(b) after addition of 12.5 mL of HBr

(c) after addition of 24.0 mL of HBr

(d) after addition of 25.0 mL of HBr

(e) after addition of 37.0 mL of HBr

You need to prepare an acetate buffer of pH 5.52 from a 0.881 M acetic acid solution and a 2.64 M KOH solution. If you have 875 mL of the acetic acid solution, how many milliliters of the KOH solution do you need to add to make a buffer of pH 5.52? The pKa of acetic acid is 4.76.

A-

What is the pH of a buffer prepared by adding 0.405 mol of the weak acid HA to 0.305 mol of NaA in 2.00 L of solution? The dissociation constant Ka of HA is 5.66×10−7.

Express the pH numerically to three decimal places.

B-

What is the pH after 0.150 mol of HCl is added to the buffer from Part A? Assume no volume change on the addition of the acid.

Express the pH numerically to three decimal places.

C-

What is the pH after 0.195 mol of NaOH is added to the buffer from Part A? Assume no volume change on the addition of the base.

Express the pH numerically to three decimal places.

The buffer system in human blood buffer is composed of HCO₃^- and H₂CO₃. (The K_a for carbonic acid is 7.9 x 10 ^-7).

a. Please identify the acidic and basic component of the buffer.

b. Please write the chemical equation that will happen when additional HCl is added into the buffer. (Hint: acids like to react with bases.)

c. Please write the chemical equation that will happen when additional NaOH is added into the buffer. (Hint: bases like to react with acids.)

d. What is the effective buffer range?

e. In order for our body to function properly, the pH of blood needs to be maintained between 7.35-7.45. If the pH of the buffer is measured to be 7.40, what is the ratio between HCO₃^- and H₂CO₃?

f. If the concentration of HCO₃^- is 5 times that of H₂CO₃, what is the pH of the buffer?

A gaseous mixture of O2 and N2 contains 40.8 % nitrogen by mass. What is the partial pressure of oxygen in the mixture if the total pressure is 385 mmHg ? Express you answer numerically in millimeters of mercury.

Three gases (8.00 g of methane, CH4, 18.0 g of ethane, C2H6, and an unknown amount of propane, C3H8) were added to the same 10.0-L container. At 23.0 ∘C, the total pressure in the container is 4.60 atm . Calculate the partial pressure of each gas in the container. Express the pressure values numerically in atmospheres, separated by commas. Enter the partial pressure of methane first, then ethane, then propane.

Which would be the best emulsifier of soil if soft water (no Ca²⁺ ions, Mg²⁺ ions, and so on) were used?

a. A soap.

b. A detergent.

c. Both would be about the same.

Explain your answer: ________________________________

Lead (II) nitrate and aluminum chloride react according to the following equation: 3Pb(NO3)2 + 2AlCl3 → 3PbCl2 + 2Al(NO3)3. In an experiment, 8.00 g of lead nitrate reacted with 2.67 g of aluminum chloride.

A. Which reactant was the limiting reagent?

B. What is the theoretical yield of lead chloride?

C. If 5.55 g of lead chloride is produced, what is the percent yield (actual amount of product divided by theoretical amount of product)?

The specific heat capacity of silver is 0.24J/C.g .

Calculate the energy required to raise the temperature of 151.0 g from 278 K to 299 K.

Energy = J

Calculate the energy required to raise the temperature of 1.0 mole of by 1.0°C (called the molar heat capacity of silver).

Molar heat capacity = J/°C ⋅ mol

It takes 1.38 kJ of energy to heat a sample of pure silver from 11.4°C to 15.1°C.

Calculate the mass of the sample of silver. Mass = g

Consider the following system at equilibrium where Kc = 1.29×10-2 and H° = 108 kJ/mol at 600 K.

COCl2 (g) CO (g) + Cl2 (g)

The production of CO (g) is favored by:

Indicate True (T) or False (F) for each of the following:

___
T
F
1. decreasing the temperature.
___
T
F
2. increasing the pressure (by changing the volume).
___
T
F
3. decreasing the volume.
___
T
F
4. adding COCl2 .
___
T
F
5. removing Cl2 .


Consider the following system at equilibrium where Kc = 77.5 and H° = -108 kJ/mol at 600 K.

CO (g) + Cl2 (g) COCl2 (g)

The production of COCl2 (g) is favored by:

Indicate True (T) or False (F) for each of the following:

___
T
F
1. decreasing the temperature.
___
T
F
2. decreasing the pressure (by changing the volume).
___
T
F
3. decreasing the volume.
___
T
F
4. removing COCl2 .
___
T
F
5. removing Cl2 .

Based on the thermodynamic properties provided for water, determine the energy change when the temperature of 0.750 kg of water decreased from 111 °C to 51.0 °C.

Copper has been used for thousands of years, either as a pure metal or in alloys. It is frequently used today in the production of wires and cables. Copper can be obtained through smelting or recycling. Determine the energy associated with each of these processes in order to recycle 1.43 mol Cu. The smelting of copper occurs by the balanced chemical equation:

CuO(s)+CO(g) -----> Cu(s)+CO2​(g)

where ΔH°f,CuO is = –155 kJ/mol. Assume the process of recycling copper is simplified to just the melting of the solid Cu starting at 25°C. The melting point of Cu is 1084.5°C with ΔH°fus = 13.0 kJ/mol and a molar heat capacity, cP,Cu = 24.5 J/mol·°C. What is the enthalpy change for the reaction recovering Cu from CuO?