1307_exam 2_fall2018FORMC.pdf - Exam 2 CHEM 1307 Texas Tech...

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1307_exam 2_fall2018FORMC.pdf

1 )   Linolenic acid ( C 18 H 30 O 2 - M.W. = 278.42 g / mol ) reacts with hydrogen gas according to the equation : 1 ) C 18 H 30 O 2 + 3H 2 ( g ) → C 18 H 36 O 2 What volume of hydrogen gas , as measured at P = 1.00 atm and T = 273.15 K , is required to react with 10.5 g of linolenic acid in this reaction ?
A ) 422 mL
B ) 1.69 L
C ) 2.54 L
D ) 1.27 L
E ) 845 m L 2 ) Aluminum oxide forms when aluminum reacts with oxygen .
2 )   Aluminum oxide forms when aluminum reacts with oxygen . 2 ) 4Al ( s ) + 3O 2 ( g ) → 2 Al 2 O 3 ( s ) A mixture of 82.49 g of aluminum ( M.W. = 26.98 g / mol ) and 117.65 g of oxygen ( M.W. = 32.00 g / mol ) is allowed to react . What mass of aluminum oxide ( M.W. = 101.96 g / mol ) can be formed ?
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3 )   Assuming ideal behavior , what is the density of argon gas at STP , in g/ L ?
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4 )   In the following reaction , what ions , if any , are spectator ions ? Pb ( NO 3 ) 2 ( aq ) + 2 NaCl ( aq ) → PbCl 2 ( s ) + 2 Na NO 3 ( aq ) 4 )
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5 )   Which of the following gases effuses most rapidly ?
A ) Oxygen
B ) Ammonia
C ) Hydrogen chloride
D ) Nitrogen
E ) Carbon monoxide
6 )   A 0.850 - mole sample of N 2 O ( g ) , a gas used as an anesthetic by dentists , has a volume of 20.46 L at 123.° C and 1.35 atm . What would be its volume at 468 .° C and 1.35 atm ?
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7 )   How many m L of concentrated nitric acid ( HNO 3 , 16.0 M ) should be diluted with water in order to make 8.00 L of 2.00 M solution ?
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8 )   What is the final temperature when 20.0 g of water at 20 . ° C is mixed with 30.0 g of water at 80.° C ? The specific heat of water is 4.18 J / g C o .
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9 )   Calculate the number of moles of HCl present in 62.85 mL of 0.4530 M hydrochloric acid ( aq ) .
A ) 0.02847 mol
B ) 28.53 mol
C ) 1.042 mol
D ) 0.007211 mol
E ) 0.1397 mol
10 )   How many grams of oxygen are needed to react completely with 200.0 g of ammonia , NH 3 ? 10 ) 4 NH 3 ( g ) + 5O 2 ( g ) → 4 NO ( g ) + 6 H 2 O( g )
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11 )   A system receives 275 J of heat and delivers 725 J of work . Calculate the change in the internal energy , Δ E , of the system .
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12 )   What is the oxidation number of sulfur in sulfur dioxide ( SO 2 ) .
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13 )   What is the percent yield for the reaction PCl 3 ( g ) + Cl 2 ( g ) → PCl 5 ( g ) 13 ) If 119.3 g of PCl 5 ( M.W. = 208.2 g / mol ) are formed when 61.3 g of Cl 2 ( M.W. = 70.91 g / mol ) react with excess PCl 3 ?
A ) 51.4 %
B ) 43.7 %
C ) 66.3 %
D ) 195 %
E ) 85.0 %
Exam 2 CHEM 1307 Texas Tech University Fall 2018 FORM C MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. This exam has 30 questions, and you have 90 minutes to complete the exam. Each question is weighted equally. Feel free to record your responses on this exam as the exam is yours to keep. Only your scantron form will be graded. 1) Linolenic acid (C 18 H 30 O 2 - M.W. = 278.42 g/mol ) reacts with hydrogen gas according to the equation: C 18 H 30 O 2 + 3H 2 (g) C 18 H 36 O What volume of hydrogen gas, as measured at P = 1.00 atm and T = 273.15 K, is required to react with 10.5 g of linolenic acid in this reaction? 1) 2 A) 422 mL B) 1.69 L C) 2.54 L D) 1.27 L E) 845 mL 2) Aluminum oxide forms when aluminum reacts with oxygen. 4Al( s ) + 3O ( g ) 2Al O ( s ) 2)
2 2 3 A mixture of 82.49 g of aluminum (M.W.= 26.98 g/mol) and 117.65 g of oxygen (M.W. = 32.00 g/mol) is allowed to react. What mass of aluminum oxide (M.W. = 101.96 g/mol) can be formed?
3) Assuming ideal behavior, what is the density of argon gas at STP, in g/L? 3)
4) In the following reaction, what ions, if any, are spectator ions? Pb(NO 3 ) 2 ( aq ) + 2NaCl ( aq ) PbCl 2 ( s ) + 2NaNO 3 ( 4) aq )
5) Which of the following gases effuses most rapidly ? A) Oxygen B) Ammonia C) Hydrogen chloride D) Nitrogen E) Carbon monoxide 5)
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