gas+stoichiometry+and+kinetic+molecular+theory

gas+stoichiometry+and+kinetic+molecular+theory - Principles...

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Gases and the Kinetic Molecular Theory Principles of General Chemistry, 2 nd ed. By M. Silberberg Chemistry, 8th ed. by W. Whitten, R. Davis, R., M. L. Peck, and G. Stanley. 1. A steel tank used for fuel delivery is fitted with a safety valve that opens if the internal pressure exceeds 1.00 x 10 3 torr. It is filled with methane at 23 o C and 0.991 atm and placed in boiling water at exactly 100 o C. Will the safety valve open? Exercises 2. A scale model of a blimp rises when it is filled with helium to a volume of 55.0 dm 3 . When 1.10 mol of He is added to the blimp, the volume is 26.2 dm 3 . How many more grams of He must be added to make it rise? Assume constant T and P . 3. A steel tank has a volume of 438 L and is filled with 0.885 kg of O 2 . Calculate the pressure of O 2 at 21 o C. Solutions P 1 = 0.991 atm (convert to torr) P 2 = unknown T 1 = 23 o C (convert to K) T 2 = 100 o C (convert to K) P 1 T 1 P 2 T 2 = 0.991 atm x 1 atm 760 torr = 753 torr P 2 = P 1 x T 2 T 1 = 753 torr x 373 K 296 K = 949 torr 1. V and n remain constant and Solutions n 1 = 1.10 mol n 2 = unknown (find, then subtract n 1 ) V 1 = 26.2 dm 3 V 2 = 55.0 dm 3 2. P and T are constant V 1 n 1 V 2 n 2 = n 2 = n 1 V 2 V 1 n 2 = 1.10 mol x 55.0 dm 3 26.2 dm 3 = 2.31 mol He n add’l = 2.31 mol He – 1.10 mol He = 1.21 mol He 1.21 mol He Mass (g) of He = 4.003 g He 1 mol He = 4.84 g He x Solutions 3. V = 438 L T = 21 o C (convert to K) n = 0.885 kg O 2 (convert to mol) P = unknown 21 o C + 273.15 = 294 K 0.885 kg x 10 3 g kg mol O 2 32.00 g O 2 = 27.7 mol O 2 P = nRT V 27.7 mol 294 K atm•L mol•K 0.0821 x x 438 L = 1.53 atm 6 Mass-Volume Relationships in Reactions Involving Gases (gas stoichiometry) 2 mol KClO 3 yields 2 mol KCl and 3 mol O 2 2(122.6g) yields 2 (74.6g) and 3 (32.0g) Those 3 moles of O 2 can also be thought of as: 3(22.4L) or 67.2 L at STP g) ( 2 (s) MnO (s) 3 O 3 + KCl 2 KClO 2 2
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7 Mass-Volume Relationships in Reactions Involving Gases Example: What volume of oxygen measured at STP, can be produced by the thermal decomposition of 120.0 g of KClO 3 ? 8
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This note was uploaded on 07/24/2011 for the course CHEM 16 taught by Professor Siao during the Spring '07 term at University of the Philippines Diliman.

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gas+stoichiometry+and+kinetic+molecular+theory - Principles...

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