STOICH IOMETRY PROB LE MS

Answer KeY

Familiar Quantities of Matter-Qng-Sten Problems,pp. tll. 96 oranges2. 12 kilograms3. 4(l kilo$arns4. 1,75 dozenE.5xt022bags

Familiar Quantities of Matter-T*o-Step Problems,pp.Ll. 6 boxes2.5 x l06boxes3. 100 kilograms4- 22.5 boxes5. 12 kilograms6. 4.6 x I0'r) granules

Moles of Elements-One'StePProblerns, pP. gl. 2.00 moles2. 0.500 mole3. 0.600 mole4. 1.66 x I()-s nrole

5. 1.66 x l0 -" rnole6. 2.0 moles7. 0.500 mole8. 4.30 moles9. 128 moles

10. 2.47 x 10-a mole11. 230 g

12. 261 g

13. 540 g

14. 0.0591 s15. 1.08 x 108 g

16. i.8l x 1024 atoms

17, 5.12 x 1024 atomsIB. 1.51 x 1026 atoms

iS. 6.02 x 1020 atoms20. 6.0 x 10rs atotns

Moles of Elements*T$o-StePProblems, PP. lli. 40.i g

2. 4t.B E

3, 29.4 g

4. 4.49 x 10-so g

5. 3.92 x l0-*,g6. 1.20 x 102s atoms

?. 8.98 x 102s atomsB. 6.02 x 1022 atoms

9. 4.95 x 1026 atoms

t0. 8.6? x 1022 atoms

Molee of ComPounds-One-Steo Prritrlems-pp, I tl1. 1.00 mole2. 0.300 moie3. 0.251 mole4. I.66 x 10-2'mole5. 1.66 x l0-2a mole6. 2,0 moles7. 0.500 mole8. 20.0 moies0. 0.0918 mole

10. 0.0171 mole1L85g12. 263 g

13. 11 g

14. 0.284 g

15. 0.0215 g

16. 1.2 x l.()a molecuies17. 1.1 x l02a molecules18. 2.ll x 1025 molecules19. 3.01 x I0r2 molecules20. 6.02 x l02o molecules

Moles of ComPourds*Two-SteP Problerns'pp. l0

1. 1.2 x 10'o molecules

2. 3.0 x 1023 molecules3. 3.0 x 10"3 molecuies4. 1.00 x 105 molecuies5, 3.9t x 102) molecules6. 71,0 g .

7. 32.4 g

8. 132 g.9, 5.66 x 10-20 g

10. 2.99 x 10-23 g

Molar Volume*One-StePProblems, pp' I I

1. 2.00 rnoles2. 0.500 mole3. 0.0446 mole4. 0.002 23 mole6. 0.008 93 mole6. 67.2 dm3

?. 67.2 dm3

8 33.6 drn3

9. 2.24 dm"

i0. 0.112 ctnt"

Molar Volume*Multi-StePProhlerns,.PP, 1 I

1. li.2 dm''

2. 7.44 clnf:1. 3.?2 x l0-'o dm'4. 3.72 x 10-2" dm3

5. 22.4 dm3

6, li.z dm3

7. 0.509 dm3

B. 56.0 g

9. 9.60 g

10. 1.87 g

ll. ;1.01 x 102:' moleculcs

12. 5.38 x 1022 tnoiecules

13. 2.6.q x 1010 molecuies

IitemrFtind tr'ormrrln-c-

pp.i.

2.

rn*,3., formula units of l{clmole of H atoms

mole of Cl atoms

mole of formula units of

I{rSOr2 moles of H atoms

1 mole of S atoms

4 moles of O atoms

3. 2 moles of formula units of

Na,COs4 moles of Na atoms

2 moles of C atoms

6 moles of O atoms

4. 3 moles of formula units of

Ca(OH)g3 moles of Ca atoms

6 moles of O atoms

6 moles of H atoms

5. 4 moles of formula units of

CuSOn'5HzO4 moles of Cu atoms

4 moles of S atoms

36 moles of O atoms

40 moles of H atoms

6. 0'10 mole of Jormula units of

HgO0.20 mole of H atoms

0.10 mole of O atoms

?. 0.60 mole of formula units of'CaCOe

0.60 mole of Ca atoms

0.50 mole of C atoms

1.5 moles of O atoms

8. 0.30 mole of formula units of

HePOr().90 mole of H atoms

0.30 mole of P atoms

1.2 nroles of O afoms

9. 1.50 moies of formula units of

NaCl1.50 moles of Na atoms

I.50 moles of CI atoms

10. 0.0010 mole of formula units of

HzSO+0.0020 mole of H atoms

0.0010 mole of S atoms

0.0040 mole of O atoms

SlOICHIOMETRY PROBLEMS

Answer K€1/ (continued)

Determining EmpiricalFormllas, pp. I qL L;aOIz

2. SO2

3. CH4, NH35, Al0ls6. KMnOr7, Agro8. Compoun<i l: CO9. Compound 2: COz

Empirical Formulas*An Extra

foi;t:tation' ee' ej

2. FeaOr3. (NH.)rs4. AI,(SO4)85. NO?, NzOo, N:oa, No, and N3o

Empirical Formulas of HYdrates'p- at1, Mn0lz 4tIeO2. CoClz'ZH,O and CoClr'6HzC)

3. Na,HPOr'12H2O

Molecular l'ormulas ofComnounds-pp, e11. NzOr2. Pd2H4

3. CsHr6

Determidrg PercentageComposition from a Formula,pp, 3t

1. Na: 39.35',11

Cl: 60,65%

2. Ca: 54.09%

O:43.18%H:2.73%

3. H: 5.94%

O: 94.06%

4. Na: 32.38%

S:22.57o/,

O:45.A5%

5. Ba: 65.95?(

Cl: 34.05%

6. 71.47"7.74.L9%8.72.36%9. 52,94%

10. 92.61%

Percentage of Water in aIlydrate, P, 3e1. 63.18% 4 4+'bth'

2.24.51% 5' 47'68%

3, 45.70%

Apptication of l'ert'entaeeComPosition' P' 3 51. 36.4 g

Z. M,4 g3. 34.8 g

Mass-Volume Problems,pp. q71.285 s2. L.7B x 103 dm3

3. llll:4. tlt s5. 420 dm'6. 0.498 g

Molecule -Mass-Volurne

i];rj1*q PP. {12. 89.3 dm,l3. 3.30 x l0% formula units

Gases at Nonstandard

i"lli'f?i; i' s l2. 275 drna

!. 556 dmn4. 120 g

Llmiting-Reactant prol.rlems,

PP:. 5 ql. 43.u om"2. 9.5 g HrO3. 1.90 g PrO,u4. 1.67 g P5. i.66 g

ti. 0.0380 dm3 of O"

4. li.A g

5, 28.2 g

Interpreting EquationCoefficients as Nrrmbers ofMolecules, pp. l 3El. 5 molecules2, 4000 molecules3.6 x l0'?srnnlecules4, 160 atoms5.4 x lO?molecules6. 56 moiecr.rles7. 3.01 x I02a molecules

Inter?retjrrg EquationCoefficiente as Moles,pp. 401. 20 moles2. 100 moles3. 0.1 mole4. 250 moles5. 0.25 mole6. 160 moles

Interpreting EquationCoefflcients as Gas Volumes,pp.r tlll, 1.00 x ld] dm32. 56.0 cm33. 1.60 x 103 cm34. B dm3

Mass-Maee Prolrlamo,pp. tlsI- 120 x 10" g

2. 7.23 x l1s g

3. 10.6 g

4. 1r5 g

5. 64.5 g

6. 175 g