General Chemistry Answers

xplain how you use it for marking volumetric measurements.    

H2 (g) + CO2 (g) ↔  CO (g) + H2O (g) 

If 1.50 mol of each chemical species are placed in a 3.00 L flask and allowed to achieve the equilibrium above, what mass of CO will be present at equilibrium? (Keq = 3.59)

What is the most KNO3 that can be dissolved in 250 mL of water at 45°C?

a.   How does the rate of production of X₂ (average and instantaneous rates) compare to the rate of disappearance of X?

15.0 L of an ideal gas at 298 K and 3.36 atm are heated to 383 K with a new pressure of 6.00 atm. What is the new volume in liters?

Select all of the following which can increase the rate of a reaction.

a. Decreasing the volume on the reaction vessel in which the reactants are gases.

b. Decreasing the pressure on the reaction vessel in which the reactants are aqueous solutions.

c. Decreasing the concentration of an aqueous solution.

d. Increasing the surface area in which the reaction can take place.

e. Adding an inhibitor to a reaction.

1. What is the pH of a 0.34 M solution of (weak acid) HF if the Ka = 6.8x10-4

?

2. If the pH of a weak acid solution is 9.5 and the original concentration of base was 0.30 M

A. what is the pOH?

B. what is the concentration of OH-

?

C. what is the equilibrium concentration of the base?

D. what is the Kb of the base?

3. Find the pH of a 0.325 M (weak acid) acetic acid solution. Ka = 1.8 x 10-5

.

4. Find the pH of a 0.056 M (weak acid)propionic acid solution (Ka = 1.4 x 10-5

).

5. Find the pH of a 0.075 M solution of (weak acid) formic acid. The acid dissociation

constant (Ka) for formic acid is 1.8 x 10-4

.

6. Find the pH of a 0.15 M solution of (weak base) ammonia, NH3. Kb = 1.8 X 10-5

7. Find the pH of a 0.600 M solution of (weak base) methylamine CH3NH2. Kb = 4.4 x 10–4

.

8. If the pH of (weak acid) HC3H5O2 is 4.2 and the Ka = 1.34x10-5

A. what is the equilibrium concentration of HC3H5O2?

B. what was the initial concentration of HC3H5O before dissociation?

In a chemical reaction, 42 g of Zinc are produced. Determine % yield if the theoretical amount is determined to be 58g.

A gallon of water weighs 8.34 pounds, which in the metric system is 3.78 kg or 3780 g

A silver bar with a mass of 250. g is heated from 22.0°C to 68.5°C. Assume the specific heat of silver is

0.235 J/g °C. How much heat does the silver bar absorb? Is this endothermic or exothermic?