The requirement that a reversible reaction be at equilibrium is that:
2 answers:
Answer: - the velocity for the forward reaction equal that of the reverse reaction
Explanation:-
Equilibrium constant is defined as the ratio of concentration of product to the concentration of reactants each raised to the power their stoichiometric ratios. It is represented by the symbol 'K'. For the general equilibrium equation:
The expression for equilibrium constant is given as:
Characteristics of equilibrium reaction:
Chemical equilibrium are attained is closed system.
The macroscopic remains constant like: volume, pressure, energy etc.
Rate of forward reaction is equal to the rate of backward reaction. The concentration of the reactants and products remain constant.They are not always equal.
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Answer:
(a) 0.699 kJ/K
(b) -0.671 kJ/K
(c) 0.028 kJ/K
Explanation:
The Refrigerant-134a flows into the evaporator as a saturated liquid-vapor mixture and flows out as a saturated vapor at a saturation pressure of 160 kPa and temperature of -15.64°C (estimated from the Saturated Refrigerant-134a Temperature Table).
(a) The entropy change of the refrigerant (ΔS) = Q/T
Q = 180 kJ
T = -15.64 + 273.15 = 257.51 K
ΔS = Q/T
= 180/257.51 = 0.699 kJ/K
(b) The entropy change (ΔS) of the cooled space (ΔS
) = -Q/T
Q = -180 kJ
T = -5 + 273.15 = 268.15 K
ΔS = Q/T
= -180/268.15 = -0.671 kJ/K
(c) The total entropy change for this process (ΔS) = ΔS
+ ΔS
= 0.699 - 0.671 = 0.028 kJ/K