6) Which of the following is always true for an isothermal process of an ideal g

Question

6) Which of the following is always true for an isothermal process of an ideal gas? (a) The intemal energy does not change. (b) No heat flows into or out of the system (c) The pressure does not change (d) The volume does not change. (e) No work is done by or on the system 17) For the reaction 2NO(g) + Odg) 2NOdg), MP--113. 1 kJ/mol and aso-.14 5.3 JK mol. Which of these statements is true? a. The reaction is spontaneous at all temperatures b-The reaction is only spontaneous at low temperatures. c. The reaction is only spontaneous at high temperatures. d·The reaction is at equilibrium at 25°C under standard conditions. e. Go becomes more favorable as temperature increases.

Explanation / Answer

16)

For isothermal process, there is no temperature change

So, internal energy which is defined as

delta U = n*Cv*delta T = 0

heat may flow, pressure and volume may change and work may be done

Answer: a

17)

delta H and delta S are both negative

use:

delta G = delta H - T*delta S

so, delta G will be negative at low temperatures

So, reaction is spontaneous at low temperatures

Answer: b

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