1) What equations can be used to determine the full state of a gas beyond critical?

2.) When the gas phase is limiting, what can you say about the value of kg?

3.) Psychometry: Which among the following choices have a moisture content less than or equal to 0.05 kg H2O/kg dry air?There may be more than one answer.

a. 8% relative humidity, 92oC dry bulb temperature

b. 25%C dry bulb temperature, saturated

c. 0.95 m3/kg dry air specific volume, 25 degC dew point temperature

d. 42degC dry bulb temperature, saturated

e. 70degC dry bulb temperature,130kJ/kg dry air enthalpy

f. 100degC dry bulb temperature,33degC wet bulb temperature

g. 20% relative humidity, 40deg C wet bulb temperature deg C

4.) What equations can be used to solve the heat transfer coefficient of a fluid flowing through a flat plate?

5.) What equations are useful in determining the actual number of plates in a distillation column?

6.) For an X-Y diagram, the operating line exists above the equilibrium curve for _____.

Problem solving

1.) The henry's law constant for oxygen dissolving in water is 1.7x10^-6 mol/L*mmHg at 25 degrees C. Atmospheric pressure is 760mm Hg and that air is 21% oxygen. What is the concentration (mol/L) of oxygen in water that is exposed to the air at 25 degrees C?

2.) The absorbance of a 1.376·10-3 mol/L [Fe(SCN)]2+ (iron(III) thiocyanate) solution was found to be 0.632. If the percent transmittance (% T) of a [Fe(SCN)]2+ solution of unknown concentration in the same cuvet was 39.2 %, the concentration of the complex ion in the unknown solution would be:

3.) There is an equimolar mixture of acetone and water that is to be fed to a distillation tower at 102 kmol/h. It is expected to recover 89 mol% acetone in the distillate and 79 mol% water in the bottoms. The average volatility of the feed is 1.81. Determine the minimum number of theoretical equilibrium stages needed assuming total reflux.

pur-new-sol

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