Thermodynamics T1

which of the following quantities has a value of 1 in an ideal mixture?

• partial pressure

• fugacity

• fugacity coefficient

• activity

which of the following substances make an ideal mixture?

• water-oil

• benzene-toluene

• toluene-ethanol

• acetone-chloroform

What is the thermodynamic state of the green point?

• saturated vapor

• superheated vapor

• dew point

• boiling point

which of the following equations applies to an ideal mixture?

• $P\phi_iy_i=\phi_i^0P_i^0x_i$

• $P\phi_iy_i=\phi_i^0P_i^0x_iy_i$

• $Py_i=P_i^0x_i$

• $P\phi_iy_i=P_i^0x_iy_i$

Based on the figure, the value of

 $\Delta H_{mix}$  of water and ammonia in the liquid state is

• negative

• positive

• zero

• undetermined

in a binary system, an azeotrope occurs when

• y=x

• there is a minimum in the bubble point curve

• there is a maximum in the dew point curve

• z=x

The Gibbs free energy is defined as

• U + PV

• H - TS

• H + PV

• U - TS

A partial molar quantity is a partial derivarive under constant

• T, P and nj equal to ni

• V,P and nj not equal to ni

• T,P and nj not equal to ni

• V,P and nj equal to ni

the activity coefficient in a binary mixture can be

• both negative

• one positive and the other negative

• both greater or both less than 1

• one greater than 1, the other less than 1

in a binary system with a miscibility gap, the activity coefficient are:

• > 0

• < 0

• = 0

• it depends on the system