Chapter9TheMoleConcept.docx

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1、Chapter 9: The Mole ConceptPractice Problemsthe term for a temperature of 0C and a pressure of 1 atm? atmospheric temperature and pressure experimental temperature and pressure ideal gas temperature and pressure standard temperature and pressure none of the above2. How many atoms of cobalt equal a m

2、ass of 58.93 g?(a)1(b)27(c)58.93(d)59(e)6.02 x 10233. Which of the following is equal to 1.00 mole of substance?JZa b(X z(6.02 x 1()23 potassium atoms, K6.02 x 1()23 bromine molecules, Br2XI/ x)z JZ c d e z( z(y z(6.02 x 1()23 potassium bromide formula units, KBr all of the abovenone of the above4.

3、How many krypton atoms arc in 2.50 mol of Kr gas?(a) 1.51 x 1()22 atoms(b) 1.51x1()23atoms(c) 1.51x1024atoms(d) 2.41x1()23atoms(e) 2.41x1 ()24atomsHow many methane molecules are in 0.500 mol of CH4 gas?(a) 1.20x1()23molecules(b) 1.20x1()24molecules(c) 3.01x102molecules(d) 3.01x1()23molecules(e) 3.01

4、x1()24moleculesHow many moles of argon gas contain 7.52 x 1()22 z atoms?(a) 0.0125 mol(b) 0.0801 mol(c) 0.125 mol(d) 0.801 mol(e) 1.25 molHow many moles of ammonia contain 1.51 x 1()24 NH3 molecules?(a) 0.251 mol(b) 0.399 mol(c) 2.51 mol(d) 3.99 mol(e) 25.1 molWhat is the molar mass of aspirin, C9H8

5、O4?(a) 29.02 g/mol(b) 116.08 g/mol(c) 180.17 g/mol(d) 244.17 g/mol(e) 252.25 g/molWhat is the molar mass of caffeine, C4H5N2O?(a) 43.03 g/mol(b) 97.11 g/mol(c) 102.16 g/mol(d) 113.11 g/mol(e) 116.17 g/molWhat is the molar mass of cholesterol, C27H45OH?(a) 30.03 g/mol(b) 386.73 g/mol(c) 431.78 g/mol(

6、d) 432.79 g/mol(e) 448.79 g/molWhat is the mass of 4.50 x 1()22 atoms of gold, Au?(a) 0.0679 g(b) 0.0748 g(c) 13.3 g(d) 14.7 g(e) 2640 gHow many methane molecules, CH4, have a mass equal to 3.20 g?(a) 1.20 x 1()23 molecules(b) 1.20x1()24molecules(c) 1.93x1()24molecules(d) 3.01x1()23molecules(e) 3.01

7、x1()24molecules13.14.15.How many bromine molecules, Br2, have a mass equal to 31.8 g?(a)1.20 x 1()23 molecules(b) 1.51 x ()24 molecules(c) 1.91 x 1()25 molecules(d) 2.40 x 1()23 molecules(e) 3.03 x 1()24 moleculesWhat is the mass in grams of a single atom of carbon?(a) 1.38x 10-25 g(b) 1.66 x 10一24

8、g(c) 2.00 x IO-23 g(d) 5.02 x IO22g(e) 7.22 x 1024gWhich of the following gases occupies 22.4 L at STP?(a) 1 mol hydrogen, H2(b) 1 mol nitrogen, N2(c) 1 mol of oxygen, 02(d) all of the above(e) none of the above16.What is the volume of 2.75 x 1024 molecules of ammonia gas, NH3, at STP?0.00977 L0.204

9、 L4.57 L4.90 L102 L17.How many carbon dioxide molecules are in 500.0 mL 01 CO2 gas at STP?(a)1.34 x 1()22 molecules(b) 2.23 x 1()21 molecules(c) 2.23 x 1()25 molecules(d) 2.70 x 1()22 molecules(e) 2.70 x 1()25 molecules18.What isXI/ ,7 J7 JZ a b c d e z( z(- z( z( z(the mass of 5.00 liters of oxygen

10、 gas, O2, at STP? 0.286 g3.50 g6.40 g7.14gH2gat STP?the volume occupied by 10.0 g of nitric oxide gas, NO,0.333 L7.46 L13.4 L67.2 LThe formula for the illegal drug cocainc is C17H21NO4. What is the percentage ofcarbon in the compound?(a) 3.96%(b)4.62%(c)6.99%(d)21.1%(e)67.3%The formula for the illeg

11、al drug cocaine is C17H21NO4. What is the percentage of hydrogen in the compound?(a) 0.333%(b) 4.62%(c) 6.99%(d) 21.1%(e) 67.3%22. The formula for the illegal drug cocaine is C17H21NO4. What is the percentage of oxygen in the compound?xlz XJ a b c d e /(V z( z(x z(y z(x5.27%6.99%21.1%67.3%4.62%An em

12、erald gemstone is an impure form of the mineral beryl, Be3A12Sil6O18 What is the percentage of beryllium in the mineral?(a) 1.10%(b) 3.30%(c) 6.59%(d) 35.2%(e) 54.9%An emerald gemstone is an impure form of the mineral beryl, BegAgi 16。18 What is the percentage of aluminum in the mineral?(a) 3.30%(b)

13、 3.37%(c) 6.59%(d) 35.2%(e) 54.9%An emerald gemstone is an impure form of the mineral beryl, Bc3A12Si6O18 What is the percentage of silicon in the mineral?(a)3.30%(b)3.43%(c)6.59%(d)35.2%(e)54.9%26. If 0.500 mol of copper combines with 0.250 mol of sulfur, what is the empirical formula of the copper sulfide product?xlz XJZ s)/ x)z ,J/a b c d e/(V /(X z(x zf z(xCuSC112SCuS2C115S5none of the above27. If 0.300 mol of lead combines with 0.300 mol of sulfur, what is the empirical formula of the lead sulfide product?(a) PbSPb2SPbS2Pb3S3none of the above