Chapter 9: Stoichiometry. 9.1 Mole to Mole Objective: To perform mole to mole conversion problems.
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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