The First Law of Thermodynamics Discussion

The First Law of Thermodynamics Discussion

Work (w) takes many forms, and one of these forms is pressure-volume

work (w=—PAV). A sample containing 5.00 mol (7) of an ideal gas at

1.00 bar (P;) and 325 K (7) is compressed at constant temperature by a

constant pressure of 10.0 bar (P;). Determine the amount of pressure—

volume work, in joules, required for this process.

How much work, in joules, is necessary to transport 2.50 mol of electrons

from the anode to the cathode if the potential difference is 0.25 V?

The surface area of a drop of water is 8.0 x 107° m7. If the surface tension

of water is 0.072 N/m, how much work, in joules, is necessary to exactly

double the surface area?

A stretched piece of an elastic polymer exerts a force of 1.75 N. How

much work, in joules, is necessary to stretch the polymer by 2.54 cm?

The relationship w,.., = nRT |n( ) gives the work involved in the

irreversible compression or expansion of an ideal gas. Determine the

reversible work (w,.,.), in joules, for the expansion of 7.00 mol (7) of an

ideal gas from 10.0 bar (/,) to 2.00 bar (3) at a constant temperature of

515 Kt 75),

A sample of an ideal monatomic gas expanded adiabatically and

reversibly. The initial molar volume of the gas was 24.45 L mol! at 1.00

bar and 298.2 K (7). After the expansion, the molar volume of the gas

was 48.90 L mol! and the temperature was 187.8 K (7). Calculate the

work (w) done during the expansion.

8 » McGraw-Hill’s 500 Physical Chemistry Questions

36. The relationship wipe, = —P2(V2 — Vi) gives the work involved in the

irreversible compression or expansion of an ideal gas. Determine the

irreversible work (w,,, 2 PbO(s) 4 NO3(g) Op(g)

43. A sample of an ideal gas expanded adiabatically and reversibly. The initial

molar volume of the gas was 24.45 L mol! (V,) at 1.00 bar (P,) and

298.2 K. After the expansion, the molar volume of the gas was 48.90 L

mol”! (V,). What was the pressure (P3) of the gas after the expansion?

44. A sample of an ideal gas expanded adiabatically and reversibly. The initial

molar volume of the gas was 24.45 L mol”! (V,) at 1.00 bar and 298.2 K

(7;). After the expansion, the molar volume of the gas was 48.90 L

mol! (ey) Wh

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