Chemical Engineering Thermodynamics MCQ Questions & Answers | Chemical Engineering

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
$$\eqalign{ & d{U_{1\,\left( {salt} \right)}} + d{U_{2\,\left( {salt} \right)}} = 0 \cr & \Rightarrow m{C_A}\left( {{T_f} - {T_A}} \right) = m{c_B}\left( {{T_f} - {T_B}} \right) \cr & {\text{So,}}\,{T_f} = \frac{{{m_A}CATA + {m_B}cBTB}}{{{m_A}{c_A} + {m_B}{c_B}}} \cr} $$
So, the final temperature is dependent on concentration or composition.

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

The third law of thermodynamics states that for all crystalline substances at absolute zero temperature the entropy is zero.

$${C_p}$$ of a gas at critical point behaves like a substance with infinite thermal capacity that means the temperature of the substance doesn’t change even though heat (Thermal energy) is provided.

By first law of thermodynamics at constant volume the heat of reaction is equal to internal energy and for constant pressure process the heat of reaction is enthalpy.

Change of phase takes place usually at constant temperature as the given heat is used to break the intermolecular forces between the molecules but not to raise the thermal energy.

Distribution law is greatly used during extraction as there the distribution of species takes place.

The activation energy of a reaction is the amount of energy required for the reactants to reach the transitional state and is always positive and for different exothermic reactions its value will be different.

The given is a property relation which is valid for any system whose composition is not changing with time.