Physical Chemistry 8th Edition solutions

Physical Chemistry 8
A sample of argon of mass \(6.56\mathrm{\ g}\) occupies \(18.5\mathrm{\ dm}^3\) at \(305\mathrm{\ K}\). (a) Calculate the work done when the gas expands isothermally against a constant external pressure of \(7.7\mathrm{\ kPa}\) until its volume has increased by \(2.5\mathrm{\ dm}^3\) (b) Calculate th

Physical Chemistry 8
A vessel of volume \(22.4\mathrm{\ dm}^3\) contains \(1.5\mathrm{\ mol}\mathrm{\ H}_2\) and \(2.5\mathrm{\ mol}\mathrm{\ N}_2\) at \(273.15\mathrm{\ K}\). Calculate (a) the mole fractions of each component, (b) their partial pressures, and (c) their total pressure.

Physical Chemistry 8
The equilibrium pressure of H2 over solid uranium and uranium hydride, UH3, at 500 K is 139 Pa. Calculate the standard Gibbs energy of formation of UH3(s) at 500 K.

Physical Chemistry 8
When 2.25 mg of anthracene, C14H10(s), was burned in a bomb calorimeter the temperature rose by 1.35 K. Calculate the calorimeter constant. By how much will the temperature rise when 135 mg of phenol, C6H5OH(s), is burned in the calorimeter under the same conditions? (cH7(C14H10, s) = 7061 kJ mol1.)

Physical Chemistry 8
The mass density of water vapour at 327.6 atm and 776.4 K is 133.2 kg m3. Given that for water Tc = 647.4 K, pc = 218.3 atm, a = 5.464 dm6 atm mol2, b = 0.03049 dm3 mol1, and M= 18.02 g mol1, calculate (a) the molar volume. Then calculate the compression factor (b) from the data, (c) from the virial

Physical Chemistry 8
A certain solid sample adsorbs 0.44 mg of CO when the pressure of the gas is 26.0 kPa and the temperature is 300 K. The mass of gas adsorbed when the pressure is 3.0 kPa and the temperature is 300 K is 0.19 mg. The Langmuir isotherm is known to describe the adsorption. Find the fractional coverage of

Physical Chemistry 8
How many collisions does a single Ar atom make in 1.0 s when the temperature is 25C and the pressure is (a) 10 atm, (b) 1.0 atm, (c) 1.0 atm?

Physical Chemistry 8
A sample of 5.0 mol CO2 is originally confined in 15 dm3 at 280 K and then undergoes adiabatic expansion against a constant pressure of 78.5 kPa until the volume has increased by a factor of 4.0. Calculate q, w, T, U, and H. (The final pressure of the gas is not necessarily 78.5 kPa.)

Physical Chemistry 8
At 100C and 1.60 kPa, the mass density of phosphorus vapour is \(0.6388 \mathrm{~kg} \mathrm{~m}^{3}\). What is the molecular formula of phosphorus under these conditions?

Physical Chemistry 8
Express the van der Waals parameters a = 0.751 atm dm6 mol2 and b = 0.0226 dm3 mol1 in SI base units.

Physical Chemistry 8
(a) Could 131 g of xenon gas in a vessel of volume 1.0 dm3 exert a pressure of 20 atm at 25C if it behaved as a perfect gas? If not, what pressure would it exert? (b) What pressure would it exert if it behaved as a van der Waals gas?

Physical Chemistry 8
The dissociation vapour pressure of NH4Cl at 427C is 608 kPa but at 459C it has risen to 1115 kPa. Calculate (a) the equilibrium constant, (b) the standard reaction Gibbs energy, (c) the standard enthalpy, (d) the standard entropy of dissociation, all at 427C. Assume that the vapour behaves as a perf

Physical Chemistry 8
The following temperature/composition data were obtained for a mixture of two liquids A and B at 1.00 atm, where x is the mole fraction in the liquid and y the mole fraction in the vapour at equilibrium. /C 125 130 135 140 145 150 xA 0.91 0.65 0.45 0.30 0.18 0.098 yA 0.99 0.91 0.77 0.61 0.45 0.25 Th

Physical Chemistry 8
Nitrogen gas adsorbed on charcoal to the extent of 0.921 cm3 g1 at 490 kPa and 190 K, but at 250 K the same amount of adsorption was achieved only when the pressure was increased to 3.2 MPa. What is the enthalpy of adsorption of nitrogen on charcoal?

Physical Chemistry 8
The critical constants of methane are pc = 45.6 atm, Vc = 98.7 cm3 mol1, and Tc = 190.6 K. Calculate the van der Waals parameters of the gas and estimate the radius of the molecules.

Physical Chemistry 8
Calculate the standard enthalpies of formation of (a) KClO3(s) from the enthalpy of formation of KCl, (b) NaHCO3(s) from the enthalpies of formation of CO2 and NaOH together with the following information: 2 KClO3(s)2 KCl(s) + 3 O2(g) rH7 = 89.4 kJ mol1 NaOH(s) + CO2(g)NaHCO3(s) rH7 = 127.5 kJ mol1

Physical Chemistry 8
Assign the following molecules to point groups: (a) HF, (b) IF7 (pentagonal bipyramid), (c) XeO2F2 (see-saw), (d) Fe2(CO)9 (22), (e) cubane, C8H8, (f) tetrafluorocubane, C8H4F4 (23).

Physical Chemistry 8
The second-order rate constant for the reaction CH3COOC2H5(aq) + OH(aq)CH3CO2 (aq) + CH3CH2OH(aq) is 0.11 dm3 mol1 s1. What is the concentration of ester after (a) 10 s, (b) 10 min when ethyl acetate is added to sodium hydroxide so that the initial concentrations are [NaOH] = 0.050 mol dm3 and [CH3CO

Physical Chemistry 8
A saturated solution of Na2SO4, with excess of the solid, is present at equilibrium with its vapour in a closed vessel. (a) How many phases and components are present. (b) What is the variance (the number of degrees of freedom) of the system? Identify the independent variables.

Physical Chemistry 8
Sketch the phase diagram of the system NH3/N2H4 given that the two substances do not form a compound with each other, that NH3 freezes at 78C and N2H4 freezes at +2C, and that a eutectic is formed when the mole fraction of N2H4 is 0.07 and that the eutectic melts at 80C.