CHEM1300-Midterm-F10-answers-v1

CHEM1300-Midterm-F10-answers-v1 - CHEM 1300 Midterm Fall...

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CHEM 1300 Midterm, Fall 2010 – VERSION 1 Answers: Part A 1 Version 1 2 e 18 b 3 e 19 b 4 b 20 b 5 b 21 d 6 c 22 c 7 b 23 c 8 b 24 c 9 a 25 b 10 e 26 d 11 a 27 d 12 e 28 a 13 d 29 d 14 c 30 c 15 d 31 b 16 e 32 d 17 c 33 b
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CHEM 1300 midterm exam, Fall 2010 October 27, 2010 Version 1 Name: Student Number: . (2 points) We all like to add colour to our wardrobe! Sodium nitrite is used in the production of fiber-reactive dyes that can be used to colour non-protein fibers such as linen, cotton, and rayon. It can be prepared by passing nitrogen monoxide and oxygen gases through an aqueous solution of sodium carbonate: Na 2 CO 3 (aq) + 2 NO (g) + ½ O 2 (g) barb2right 2 NaNO 2 (aq) + CO 2 (g) The sodium nitrite solid can be recovered by drying the aqueous solution. What is the maximum mass of sodium nitrite that can be produced when 225 mL of 1.50 M aqueous solution of sodium carbonate, 22.1 g of nitrogen monoxide, and a large excess of oxygen gas are allowed to react? mol Na 2 CO 3 = (1.50 mol/L)(0.225 L) = 0.338 mol Na 2 CO 3 barb2right 0.676 mol NaNO 2 mol NO = (22.1 g)/(30.01 g/mol) = 0.736 mol NO barb2right 0.736 mol NaNO
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