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Physical Chemistry
A space vehicle of internal volume 3.0 m3 is struck by a meteor and a
hole of radius 0.10 mm is formed. If the oxygen pressure within the vehicle is
initially 80 kPa and its temperature 298 K, how long will the pressure take to
fall to 70 kPa?
hole of radius 0.10 mm is formed. If the oxygen pressure within the vehicle is
initially 80 kPa and its temperature 298 K, how long will the pressure take to
fall to 70 kPa?
Physical Chemistry
A 1.0 dm3 glass bulb contains 1.0 × 1023 H2 molecules. If the pressure
exerted by the gas is 100 kPa, what are (a) the temperature of the gas, (b) the
root mean square speeds of the molecules? (c) Would the temperature be
different if they were O2 molecules?
exerted by the gas is 100 kPa, what are (a) the temperature of the gas, (b) the
root mean square speeds of the molecules? (c) Would the temperature be
different if they were O2 molecules?
Physical Chemistry
Calculate the volume, in cubic centimeters, occupied by 0.022 mmole lead (density = 11.3 g/cc)
Physical Chemistry
Acetone, the solvent in nail polish remover, has a density of 0.791 g/mL. what is the volume, in milliliters, of 20.0 g of acetone?
Physical Chemistry
Calculate the number of formula units in 25.0 mol NaNO3.
Physical Chemistry
The standard enthalpy change of vaporization of water is +40.7 kJ mol-1. An electric kettle is rated at 3kW (1kW = 1 kJ s-1). How long will it take to evaporate 1.0 kg of water at 100°C? Give the answer in minutes.
Physical Chemistry
Consider a solute B. Show that γB,solv=γB/γ∞B. Where γB,solv is the activity coefficent assuming B is a solvent, and γ∞B is the activity coeffient assuming infinite dilution, and the ideal-dilute limit.
Physical Chemistry
Complete combustion of 4.80 g of a hydrocarbon produced 14.7 g of CO2 and 7.02 g of H2O. What is the empirical formula for the hydrocarbon? Insert subscripts as necessary.
Physical Chemistry
An experiment was carried out at 25 °C by dissolving an unknown mass of magnesium ribbon into excess 1 mol dm–3 hydrochloric acid. The volume of gas produced over a period of 6 minutes was measured using a gas syringe. The result was plotted as shown in Figure 1
Time (min)
Figure 1 Volume of gas produced against time
a)Write a balanced equation for its reaction with hydrochloric acid.
(2 marks)
Use the data from Figure 1
to determine the total volume of gas produced (1mark)
Time (min)
Figure 1 Volume of gas produced against time
a)Write a balanced equation for its reaction with hydrochloric acid.
(2 marks)
Use the data from Figure 1
to determine the total volume of gas produced (1mark)
Physical Chemistry
1) The equilibrium constant for the reaction
I2 (s) + Br2 (g) <-- --> 2 IBr (g)
is 0.164 at 25 °C.
(a)Calculate ΔG°rxn for this reaction
(b)Bromine gas is introduced into a container with excess solid iodine. The pressure and temperature are held at 0.164 atm and 25°C, respectively. Find the partial pressure of IBr (g) at equilibrium. Assume that all the bromine is in the gas form and that the vapor pressure of iodine is negligible.
I2 (s) + Br2 (g) <-- --> 2 IBr (g)
is 0.164 at 25 °C.
(a)Calculate ΔG°rxn for this reaction
(b)Bromine gas is introduced into a container with excess solid iodine. The pressure and temperature are held at 0.164 atm and 25°C, respectively. Find the partial pressure of IBr (g) at equilibrium. Assume that all the bromine is in the gas form and that the vapor pressure of iodine is negligible.
