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What is the pH of a 0.20 M solution of NH4Cl?  [Kb(NH3) = 1.8 x 10–5]

At what temperature will a fixed amount of gas with a volume of 175 L at 15°C and 760 mmHg occupy a volume of 198 L at a pressure of 640 mm Hg?

For the following reaction at equilibrium, which choice gives a change that will shift the position of equilibrium to favor formation of more products? 2NOBr(g)   ↔   2NO(g) + Br2(g),     DHºrxn = 30 kJ/mol

Which of the following would be expected to have the highest vapor pressure at room temperature?

The combustion of butane produces heat according to the equation  2C4H10(g) + 13O2(g) -> 8CO2(g) + 10H2O(l)    Δ{“version”:”1.1″,”math”:”Δ”}H°rxn = –5,314 kJ/mol  What is the heat of combustion per gram of butane?

1.018 g of Freon-113 gas is trapped in a 145 mL container at 760. mmHg and 50.0°C.  What is the molar mass of Freon-113?

If the pressure of a gas sample is quadrupled and the absolute temperature is doubled, by what factor does the volume of the sample change?

Hydrogen iodide decomposes according to the equation 2HI(g)   ↔   H2(g) + I2(g), for which Kc = 0.0156  at 400ºC.  0.550 mol HI was injected into a 2.00 L reaction vessel at 400ºC. Calculate the concentration of HI at equilibrium.

For the following reaction at equilibrium, which one of the changes below would cause the equilibrium to shift to the left? 2NOBr(g)   ↔   2NO(g) + Br2(g),     DHºrxn = 30 kJ/mol

Choose the response that lists the member of each of the following pairs that has the higher boiling point. (I) H2O or KI       (II) HF or HI      (III) Cl2 or Br2