CHM114 Final Review

• Calculate standard cell potential of • 2Cr(s) + 3Fe2+ (aq) -> 3Fe(s) + 2Cr3+ (aq)• Given standard half cell potential for Cr/Cr3+

is -0.74V and standard half cell potential for Fe/Fe2+ is -0.44V.

• An unknown element has two naturally occurring isotopes. Calculate the average atomic mass in amu.

• Calculate the moles of carbon dioxide in 52.06 grams carbon dioxide.

• Calculate the concentrations of Na+ and SO42- when dissolving 0.500 mol Na2SO4 in 1.33 L water.

• Calculate the amount in grams of NO2 produced by the combustion of 43.9 grams of ammonia.

• 4NH3(g) + 7O2(g) -> 4NO2(g) + 6H2O(g)

• Calculate the grams of H3PO4 in 175mL of 3.5M solution of H3PO4.

• Calculate delta H for the following reaction.

• Calculate the partial pressure of neon in a container of nitrogen gas, argon, helium and neon.

• Given the partial pressure of N2 is 44.0 torr, Ar is 486 torr, He is 218 torr, and the total pressure is 987 torr.

• Determine which has the strongest intermolecular forces.

• Calculate the energy required to convert 50.0g ice at 0 degrees C to liquid water at 22.0 degrees C.

• Given the heat of fusion of water is 6.01kJ/mol, the heat capacity of liquid water is 75.3 J/(molK)

• Calculate the freezing point of 0.055 m aqueous NaNO3.

• Given the molal freezing point depression of water is 1.86 degrees C/m.

• Calculate the average rate of disappearance of A between 10s and 20s in mol/s.

• Assume reaction proceeds A(g) -> B(g)

• Calculate the rate law for the reaction 2A + 3B -> products• Given A is first order and B is second order.

• Calculate the time (minutes) it takes for a concentration to decrease from 0.13M to 0.088M. Given the reaction is first order and the rate constant is 0.33 min-1

• Calculate the minimum temperature for the reaction to be spontaneous under standard conditions.

• C(s) + H2O(g) -> CO(g) + H2(g) • Given the standard delta H = 131.3 kJ/mol and

the standard delta S = 133.6 J/(Kmol) at 298K.

• The molecular geometry of the molecule is __________.

• According to kinetic-molecular theory, if the temperature of a gas is raised from 100 °C to 200 °C, the average kinetic energy of the gas will __________.