General Chemistry 2

What are the factors that affect the strength of an acid?
Calculate the pH of a mixture of equal parts 2.0 M HF and 1.0 M HOCl. Also find the concentration of OCl\(^-\) and F\(^-\) ions in the solution. The K\(_a\) of HF = 7.2 x 10\(^{-4}\), K\(_a\) of HOCl = 3.5 x 10\(^{-8}\)
By experiment, it is found that of 6.2 x 10\(^{-12}\) moles of Pb\(_3\)(PO\(_4\))\(_2\) dissolves in 1 L of aqueous solution at 25\(^\circ\)C. What is the solubility product constant, K\(_{sp}\), at this temperature?
Calculate the standard free energy change, \(\triangle\)G\(^\circ\), for the following reaction. Is the reaction spontaneous?

CH\(_4\) (g) + 2 O\(_2\) (g) \(\longrightarrow\) CO\(_2\) (g) + 2 H\(_2\)O (l)

Values of standard molar entropy, S\(_{f}^\circ\) are as follows: CH\(_4\) (g), 186 J/(K*mol); O\(_2\) (g), 205 J/(K*mol); CO\(_2\) (g), 213.6 J/(K*mol); 2 H\(_2\)O (l), 69.9 J/(K*mol)

\(\triangle\)H\(^\circ\) for this reaction is -890.3 kJ
A first order reaction has a half life of 20.0 min.

A. Calculate the rate constant for this reaction

B. How much time is required for this reaction to be 75% complete?
Find the equilibirium concentrations when starting with 0.50 M H\(_2\) and 0.50 M Br\(_2\)

H\(_2\) + Br\(_2\) \(\leftrightharpoons\) 2 HBr , K\(_C\) = 143
Rank the following in terms of acidity: HClO, IOH, and HBrO. Explain the trend.
Calculate the pH of 0.1 M NH\(_4\)Cl. The K\(_b\) of NH\(_3\) = 1.8 x 10\(^{-5}\)
Calculate the solubility (in grams per liter) of PbI\(_2\) in water from the solubility product constant 1.4 x 10\(^{-8}\).
What is the standard free energy change, \(\triangle\)G\(^\circ\), for the following reaction at 298 K? Is the reaction spontaneous?

2 PCl\(_3\) (g) + O\(_2\) (g) \(\longrightarrow\) 2 POCl\(_3\), \(\triangle\)H = - 620.6 kJ/mol

Values of standard molar entropy, S\(_{f}^\circ\) are as follows: 2 PCl\(_3\) (g), 311.8 J/K; O\(_2\) (g), 205.1 J/K; POCl\(_3\), 222.4 J/K

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