1) The absorbance of a 1

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1) 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:

2.) 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.

3.) 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?

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

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

6.) 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

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

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

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