Physical Chemistry 3rd. Edition by Robert G. Mortimer | 9780080878591 | 0123706173 | Holooly

Physical Chemistry [EXP-34184]

425 SOLVED PROBLEMS

Question: 10.2

A cubical cell 0.100m on a side is filled with benzene. The top surface is maintained at 25.0°C and the bottom surface is maintained at 15.0°C. After some time, the system will reach a steady state in which the state of the system does not change with time although heat is flowing. Calculate the

Verified Answer:

Since the top of the vessel is at a higher tempera...

Question: 24.3

A current of 1.00A is flowing counterclockwise in a horizontal circular loop 0.0500m in radius. Find the magnitude and direction of the magnetic moment.

Verified Answer:

μ=(1.00A)π(0.0500m)^{2}=0.0025Am^{2} [/lat...

Question: 11.5

A hypothetical zero-order reaction has a rate constant equal to 0.0150 mol L^−1 s^−1 at a certain temperature. If the initial concentration of the single reactant is 1.000 mol L^−1, find the concentration after a reaction time of 5.00 s at this temperature.

Verified Answer:

[A]_{t}=[A]_{0} − k_{f} t=1.000 mol L^{−1} ...

Question: 9.1

A particle moving on a horizontal dry surface is subject to a frictional force in the direction opposite to its velocity. There is no frictional force if the object is stationary. The magnitude of the frictional force is assumed to be equal to a coefficient of friction times the weight

Verified Answer:

So long as

v_{x}

is nonzero, the fr...

Question: 2.34

A pellet of naphthalene of mass 1.234 g is burned in a bomb calorimeter with Ccal=14225 JK^−1. If the initial temperature is 298.150K and the final temperature is 301.634 K, find ΔU and ΔH for 1 mol of reaction, with liquid water as one of the products. Neglect the heat of combustion of the wire

Verified Answer:

The balanced reaction equation is

C_{10}H_{...

Question: 2.5

A sample of 0.500 mol of nitrogen expands irreversibly from a volume of 5.00 L to a volume of 10.00 L at a constant external pressure of 1.000 atm (101,325 Pa). Assume that P(transmitted) is equal to Pext. Calculate w for the process. Explain why the result does not depend on the temperature or

Verified Answer:

w=-\int{P_{ext}dV} =-P_{ext}\Delta V=-(1013...

Question: 14.1

A single covalent bond is similar to a spring with a force constant near 500N m^−1. Estimate the frequency of oscillation of a hydrogen atom at one end of such a spring with the other end held fixed.

Verified Answer:

v=\frac{1}{2π} \sqrt{\frac{500Nm^{−1}}{1.67...

Question: 23.2

A solution of a certain dye has a molar absorptivity of 1.8 × 10^5 L mol^−1 cm^−1 at a wavelength of 606 nm. Find the concentration of a solution of this dye that has an absorbance at this wavelength equal to 1.65 in a cell 1.000 cm in length.

Verified Answer:

c=\frac{A}{ab}=\frac{1.65}{(1.8 × 10^{5} L...

Question: 2.21

A system consisting of 2.000 mol of argon expands adiabatically and irreversibly from a volume of 5.000 L and a temperature of 373.15K to a volume of 20.00 L at a constant Pext=1.000 atm. Find the final temperature, assuming that P(transferred)=Pext. Assume argon to be ideal with CV=3nR/2.

Verified Answer:

w=-P_{ext}\int{dV} =-P_{ext}\Delta V[/latex...

Question: 2.17

A system consisting of 2.000 mol of argon expands adiabatically and reversibly from a volume of 5.000 L and a temperature of 373.15K to a volume of 20.00 L. Find the final temperature. Assume argon to be ideal with CV equal to 3nR/2.

Verified Answer:

T=T_{1}\Bigl(\frac{V_{1}}{V}\Bigr)^{nR/C_{V...

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