Michigan State University DEPARTMENT OF CHEMICAL ENGINEERING AND MATERIALS SCIENCE CHE 210: Modeling and Analysis of Transport Phenomena Fall 2007Quiz 1: Solution1. A 10.0-ft3compressed-air is filled by adding air at a rate of 0.0117 lb-mole/s at a constant temperature of 72oF. Derive the equation for the number of lb-moles of air in the tank[N(t)] at any time t. Calculate the number of moles of oxygenin the tank after two minutes. Solution: The balance on the tank gives: Accumulation = input OR 0.0117;0 at 0dNNtdt===Integration of the equation gives the expression required: ()000.01170.0117dNdtN tt=⇒=∫∫Since air is 21 mol% O2, we calculate: 2lb-mols0.01172 min. 601.40lb-molsmin.ON=⋅⋅=2. An electrical coil is used to heat 20.0 kg of water in a closed well-insulated vessel. The water is initially at 25oC and 1 atm. The coil delivers a constant power of 2.50 kW to the vessel and its
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This note was uploaded on 05/21/2008 for the course CHE 210 taught by Professor Robertofoli during the Fall '07 term at Michigan State University.