Chemical Engineering Thermodynamics - Study Mode

[#416] No work is done by the system, when a reaction occurs at constant
Correct Answer

(A) Volume

Explanation

Solution: Here work means expansion work since the expansion work ($$W$$) and we know expansion work $$W = int {} {P_{ext}}dV$$ xa0 and since for isochoric process there will be no volume change i..e.., volume remains constant and hence $$dV = 0.$$ So, work done $$= 0$$

[#417] In the reaction, H 2 + $${I_2}$$ ⇋ 2H$$I$$, addition of an inert gas will
Correct Answer

(D) Not effect the equilibrium conditions

[#418] The work done in isothermal compression compared to that in adiabatic compression will be
Correct Answer

(B) More

Explanation

Solution: Since, the area under $$P-V$$ xa0 plot for isothermal is less than the area under $$p-v$$ xa0 plot for adiabatic process during compression. We can say adiabatic work done is more than isothermal work done.

[#419] When dilute aqueous solutions of two salts are mixed, the process is associated with
Correct Answer

(B) Increase in temperature

Explanation

Solution: According to the first law of thermodynamics $$delta Q = dU + delta W$$ So, as there is no heat exchange and assuming no work is done $$w$$ can write $$eqalign{
& d{U_{1,left( {salt}
ight)}} + d{U_{2,left( {salt}
ight)}} = 0 cr
& Rightarrow m{C_A}left( {{T_f} - {T_A}}
ight) = m{c_B}left( {{T_f} - {T_B}}
ight) cr
& { ext{So,}},{T_f} = frac{{{m_A}CATA + {m_B}cBTB}}{{{m_A}{c_A} + {m_B}{c_B}}} cr} $$ So, the final temperature is dependent on concentration or composition.

[#420] A system is said to be isopiestic, if there is no __________ change.
Correct Answer

(B) Pressure

Explanation

Solution: An isobaric process or isopiestic process is a process which is card out at constant pressure.