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Exam #1 Sample - ChE 230 Fall 2009 MIDTERM 1 Name...

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ChE 230 Name:______________________________ Fall 2009 MIDTERM 1 Instructions Open book (text only) – 90 min. Show all work Give all answers in the unit requested with the appropriate significant number 1. (a) [5pts] Explain in detail whether the following equation for flow over a rectangular weir is dimensionally consistent. q = 0.415 L 0.2 h 0 ( ) h 0 1.5 2 g if q = ft 3 s L = ft h 0 = ft g = 32.2 ft s 2 (b) [10pts] Heat capacities are usually given in terms of polynomial function of temperature. The equation for carbon dioxide is Convert the equation so T can be in o C and C p in J/(gmol) K C p = 8.4448 + 0.5757 × 10 2 T 0.2159 × 10 5 T 2 C p is in Btu lbmol ( ) o F ( ) and T in o F
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2. [20pts] A solution contains the species Na 2 S, NaOH, and Na 2 CO 3 in water. Suppose that a laboratory analysis of the solution indicates 250.0g/l Na 2 S, 50.0g/l NaOH, and 600.0g/l Na 2 CO 3 . If the solution density is 2.05 g/cm 3 , calculate the species molar flows (in kmol/hr) corresponding to a total stream flow of 1000.0 kmol/hr.
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