Problem on thermodynamics and ph

Question

Assignment:

Question 1. A quantity of 7.480g of an organic compound is dissolved in water to make 300.0 mL of solution. The solution has an osmotic pressure of 1.43 atm at 27 degrees Celsius. The analysis of this compound shows that  it contains 41.8 percent C, 4.7 percent H, 37.3 percent O and 16.3 percent N. Calculate the molecular formula of the compound.

Question 2. The Ka for benzoic acid is 6.5 x 10^-5. Calculate the pH of a 0.10 M benzoic acid solution.

Question 3. If 20.0 mL of 0.10 M Ba(NO3)2 are added to 50.0 mL of 0.10 M Na2CO3, will BaCO3 precipitate?

Question 4. Compare the molar solubility of Mg(OH)2 in water and in a solution buffered at a pH of 9.0.

Question 5. Calculate the pH of the 0.20M NH3/0.20M NH4Cl buffer. What is the pH of the buffer after the addition of 10.0 mL of 0.10M HCl to 65.0 mL of the buffer?

Question 6. Given the following absolute entropies, determine S^o for the reaction

SO₃(g) + H₂O(l) H₂SO₄(l)

		So (J/K mol)
SO3		256.2
H2O		69.9
H2SO4		156.9

Question 7. Given the following free energies of formation, calculate G^o for the reaction

3NO₂(g) + H₂O(l) 2HNO₃(l) + NO(g)

		G (kJ/mol)
H2O(l)		-237.2
HNO3(l)		-79.9
NO(g)		86.7
NO2(g)		51.8

Question 8. Nitrosyl chloride (NOCl) decomposes at elevated temperatures according to the equation

2NOCL(g) 2NO(g) + Cl₂(g)

Use the following information to calculate K_P for this reaction at 227^oC:

H^o = 81.2 kJ
S^o = 128 J/K

Question 9. Given the following free energies of formation, calculate K_P for the reaction below at 298 K.

SO₂(g) + NO₂(g) SO₃(g) + NO(g)

		G (kJ/mol)
SO2(g)		-300.4 kJ/mol
SO3(g)		-370.4 kJ/mol
NO(g)		86.7 kJ/mol
NO2(g)		51.8 kJ/mol

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