Question

32) 3.00 moles of an ideal gas are expanded isothermally against a constant pressure of 1 atm from 2.0 liters to 10.0 liters at a temperature of 20.0 C.

Which of the following is incorrect?

1. w = -PDV = -(1atm)(8 l) = -(101.3 J/l)(8 l) = -811.2 J

2. q = -w (since DU = 0) = 811.2 J

3. DU = 0 (since isothermal ideal gas)

4. DS_SYS = ∆H/T = 0

33) In general, for a thermodynamic function F, ∆F° indicates

            1. The variation of F in standard conditions

            2. F in a pure state

            3. The variation of F in a change of phase

            4. The zero-order partial derivative of F

34) Values for lnK are plotted at a function of 1/T in an experiment to determine the standard state change of enthalpy of a chemical reaction. The slope of the line is

            1. lnK at low temperatures

            2. RT (with T in Kelvin)

            3. ∆_rH°/R

            4. T (in Kelvin)

35) In general, for a pure substance in a given state, the slope of G vs. T is

            1. Greater than zero

            2. Equal to zero

            3. Less than zero

            4. Divergent

Answer 1

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