Practice Exam (II) Key

Practice Exam (II) Key - CHEMISTRY 2A-c Sample Hour Exam II...

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1 CHEMISTRY 2A-c NAME ______________________ Sample Hour Exam II - Key TA Name____________________ Feb. xx, 20xx Lab Section Number ___________ Winter 20xx Lab Room ___________________ Lecture: MWF 2:10-3:00 pm CLOSED BOOK EXAM – No books or notes allowed. Place all answers in the space provided. Be sure to write your name, your TA’s name, and your Lab Section Number in upper right hand corner. This examination contains 30 questions on 5 pages. You can use p. 6 as scratch paper for your calculations. Question Credit I. 120 points Normalized Total: 100 points Avogadro’s number: 6.022x10 23 #/mol PV = nRT= (m/M)RT KE = (1/2)mu 2 = (3/2)kT E=h ν c= λν E(n) = -A(Z/n) 2 , A=2.18x10 -18 J Δ E =A(1/n 1 2 –1/n 2 2 ) [urms (1)/urms(2)] = (M 2 /M 1 ) 1/2 p = mv = h/ λ P total = P 1 + P 2 + P 3 +---=x 1 P total + x 2 P total + x 3 P total + … R = 0.08206 L-atm/mol-K = 8.314 m 3 -Pa/mol-K = 1.987 cal/mol-K = 8.314 J/mol-K Speed of light =3x10 8 m/s h= 6.63x10 -34 J.s Mass of electron = 9.11x10 -31 kg (1/2)m e v 2 = h ν -h ν 0 4 h xp π ΔΔ ≥
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2 I. (4 points/each) Multiple Choices 1. A sample of helium gas occupies a volume of 38 L at 780 Torr and 25 ° C. What volume would the gas occupy at standard temperature and pressure? (a) 40 L (b) 38 L ( c) 36 L (d) 34 L (e) 25 L 2. 53.5 g of an ideal gas of molecular weight = 30.5 g/mol are confined at a pressure of 133 mm Hg. The density of the gas is 0.228 g/L. Compute the temperature of the gas in degree ° C. (a) 261 ° C (b) 12.1 ° C (c) -57 ° C (d) 285 ° C (e) -12.1 ° C 3. How many liters of gas is 23.4 grams of nitrogen (N 2 ) at 750 mmHg at 28.0 ° C? (a) 586 L (b) 20.9 L (c) 0.771 L (d) 20.4 L (e) 22.4 L 4. 456 milligrams of a gas occupies 52.8 mL at 22 ° C and 806 Torr. What is it molecular weight? (a) 1060 g/mol (b) 209 g/mol (c) 197 g/mol (d) 221 g/mol (e) 54 g/mol 5. In the reaction: Fe 2 O 3 + 3 H 2 2 Fe + H 2 O, how many moles of iron can be produced using 17.4 liters of hydrogen at STP? (a)
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Practice Exam (II) Key - CHEMISTRY 2A-c Sample Hour Exam II...

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