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Practice Final Exam

# Practice Final Exam - 1 A liquid mixture is prepared by...

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1) A liquid mixture is prepared by combining N liquids (densities ρ 1 , ρ 2 , . ..., ρ Ν ). The volume of liquid i added is V i and its mass fraction is x i . The components are fully miscible and the volume of the mixture equals the sum of the pure-component volumes. Show that: Density ( ρ ) of the mixture is given by: = ρ = N 1 i i i x ρ 1 . 2) Methanol (CH 3 OH) is decomposed into formaldehyde (HCHO) and hydrogen (H 2 ) in a catalytic reactor. The required production rate of formaldehyde is 1000 kg/hr. The reactor achieves a single-pass conversion of 60%. The methanol in the reactor product is separated from the formaldehyde and hydrogen, and is recycled back to the reactor. Calculate the mass balances on the process, and determine the fresh feed flow rate and the recycle flow rate. 3) Estimate the normal boiling point of benzene and its heat of vaporization at the boiling point. Then find the melting point, boiling point, and effective vapor pressure (at 30°C) of a solution containing 50 g of solid diphenyl (C 12 H 10 ) dissolved in 500 g of benzene (C 6 H 6 ). The melting point of pure benzene is 5.53°C. 4) A horizontal cylinder equipped with a frictionless piston contains 800 cm 3 of steam at 450 K and 100 kPa. 100 J of heat is then transferred to the steam. Assuming the pressure in the cylinder remains constant and that the steam behaves like an ideal gas, use the energy balance for a closed

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Practice Final Exam - 1 A liquid mixture is prepared by...

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