Considering a gas containing O2 (20%), N2 (78%), and SO2 (2%), find the composition of the gas on an SO2-free basic, meaning gas without the SO2 in it

3. Consider the activity coefficients at infinite dilution for a mixture of 2-propanol and water at 30 °C: 71 =7.32 72 = 2.97 where subscript numbers (1) and (2) are for 2-propanol and water respectively. (a) ( ) Find the van Laar parameters A and B for the mixture. (b) ( 3) Find the activity coefficients (%) for the compounds (1) and (2) in a binary mixture at 30 °C where the liquid has 40% mole of 2-propanol (i.e., ₁ = 0.4).

1. An impure sample of compound A is contaminated with two impurities B and C. The sample is to be purified by recrystallization using ethanol as the solvent. The solubility properties of the three components are summarized below. Solubility in Solubility in ethanol Solubility in 50 mL Solubility in 50 mL ethanol at -78 °C at - 0°C ethanol at -78 °C ethanol at - 0°C (g) (g) Compound A 0.12 g/mL 0.02 g/mL Impurity B 0.58 g/mL 0.04 g/mL Impurity C 0.005 g/mL 0.0003 g/mL The impure (7.5 g) sample contains 5.0 g of compound A, 1.5 g of B and 1.0 g of C and is recrystallized using 50 mL of ethanol. The sample is boiled with 50 mL of ethanol, filtered by gravity and then cooled in ice and filtered by suction. a) How much compound A should be obtained as the final product? Will the sample be contaminated with any of the impurities? Explain (using calculations to support your answer-fill in the missing masses in the table above). Hint: For this question you should calculate the mass of each…

Molecular bromine is 24 percent dissociated at 1600 K and 1.00 bar in the equilibrium Br₂(g) ⇒ 2Br(g). Calculate (a) Kp, (b) A,Gº, (c) K₂ at 2000 K given that A₁HⓇ = +112 kJ mol-¹ over the temperature range.