An aqueous solution of sodium sulfate is saturated at 32°C. The temperature to which the solution must be cooled to crystallize 60% of the solution as Na2SO4.10 H2O is : A. 28.7°C

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Dehydration of ethyl alcohol to ethylene occurs by the following reaction: C2H5OH→ C2H4 + H2O 2 moles of ethyl alcohol vapor enters an adiabatic reactor at 200 °C and 50% is transforming. What is the temperature of the products at the reactor outlet?

1 mol of sodium hydroxide (NaOH) is added to 10 L of pure water at 25°C. The ion product for water at this temperature is 1 × 10-14 mol²/L². The pH of the solution is most nearly (A) 1 (В) 2 (С) 13 (D) 14

The normal boiling point of acetone, an important laboratory and industrial solvent, is 56.2 °C and its ∆Hvap is 25.5 kJ/mol. At what temperature does acetone have a vapor pressure of 375 mmHg?

(a) Benzene and toluene form an ideal solution at 70 °C. The solution consists of 50% mole benzene. The vapor pressures (in mm Hg) for the pure component are given by the following Antoine equations: For Benzene: 1211.03 bg,,R" -6.91-: T(C) + 220.70 For Toluene: 1343.94 bg10 P - 6.95- T('C)+219.38 (i) Calculate the vapor pressure of the solution. (ii) Calculate the dew point pressure. (iii) Calculate the composition of the liquid at dew point. (b) Wet solids are dried from 30% to 8% moisture under constant drying conditions in 16.9 hours. The drying rate in the falling-rate period is a straight line through the origin. The critical and the equilibrium moisture contents are 15% and 5% respectively. Assuming a sample of same type of solids with initial moisture content of 33% is dry under the same drying conditions; determine the final moisture content of solid if it is only allowed to dry for 14 hrs.

1. A Cu-Ni alloy of composition 70 wt% Ni - 30 wt% Cu is slowly heated from a temperature of 1300°C. (1) At what temperature does the first liquid phase form? What is the composition of this liquid phase? (2) At what temperature does complete melting of the alloy occur? Composition (at% Ni) 40 0 16007 30 1500 Temperature (°C) 1400 1300 1200 13h00 1100 e 1000 T 1085°C 0 ko (Cu) 1 20 20 Liquid 1345 C Liquidus line 40 60 First liquid (59 wt% Ni) a +L Solidus line 60 Composition (wt% Ni) (a) 80 T 80 1453°C Last solid (79 wt% Ni) 100 1380°C 2800 2600 2400 2200 2000 Temperature (°F) 100 TATRA (Ni)

Ammonia gas is absorbed from an air stream by liquid water as a solvent. Conditions in theabsorber are 100°F and 50 psia. The liquid solution entering the top of the tower is 10.0 mol%ammonia. What is the composition of the gas stream leaving the top of the absorber if it can beassumed to be in equilibrium with the liquid phase? If the inlet gas contained 30.0 mol% ammonia,the equilibrium partial pressures of the two liquid components over a 10.0 mol% solution wouldbe 1.98 psia for ammonia and 0.45 psia for water. Determine the fraction of ammonia that wasremoved in the absorber.

1. The heat of combusion of a substance is defined as the enthalpy change that occurs when 1 mole of a substance reacts with elemental oxygen to form liquid water and gaseous CO2. Determine the heat available from the combustion of methane, CH9) at 25°C and a constant pressure. Express the answer in terms of kcal/mole and kcal/g.

A mixture of 40 mol% isopropanol in water is distilled at 1 atm by differential distillation until 70 mol% of the charge has been vaporized. What is the composition of the liquid residue in the still-pot and of the collected distillate?