Ch.7WorksheetAnswersw/Work
7-1
1a.Oxygen=atom b.sodiumsulfide=formulaunit c.sulfurdioxide=molecule
d.potassium=atom
2a.$15x1gallonx32miles=153miles
$3.141gallon
2b.$160x1hourx1day=2.2days
$9.008hour
1molNa
3a.5.60x1016atomsNax
= 9.30x10-8molNa
6.02x10 23 atomsNa
1molH
3b.1.44x1040atomsHx
= 2.39x1016molH
6.02x10 23 atomsH
1molCa
3c.5.96x1025atomsCax
= 99.0molCa
6.02x10 23 atomsCa
6.02x10 23 atomsNa
4a.5.60molNax
= 3.37x1024atomsNa
1molNa
6.02x10 23 atomsNi
-2
4b.3.21x10 molNix
= 1.93x1022atomsNi
1molNi
6.02x10 23 atomsF
4c.0.780molFx
= 4.70x1023atomsF
1molF
7-2PartI
5a.132.9g/molCs
b.
c.
d.
e.
f.
g.
h.
74.9g/molAs
3x12.0g+8x1.0g+1x16.0g=60.0g/molC3H7OH 1x87.6g+2x12.0g+2x14.0g=139.6gSr(CN)2 2x12.0g+6x1.0g=30.0g/molC2H6
1x31.0g+3x35.5g=137.5g/molPCl3
1x40.1g+1x32.1g+4x16.0g=136.2g/molCaSO4
2x27.0g+3x32.1g+12x16.0g=342.3g/molAl2(SO4)3
6a.MolarMass=5x12.0g+12x1.0g=72.0g/molC5H12
72.0gC5 H12
1.50molC5H12x
= 108gC5H12
1molC5 H12
6b.MolarMass=2x19.0g=38.0g/molF2
38.0gF2
14.4molF2x
= 547gF2
1molF2
6c.MolarMass=2x1.0g+2x16.0g=34.0g/molH2O2
7.00molH2O2x
34.0gH 2O2
= 238gH2O2
1molH 2O2
7a.MolarMass=1x28.1g+2x16.0g=60.1g/molSiO2
15.5gSiO2x
1molSiO2
= 0.258molSiO2
60.1gSiO2
7b.MolarMass=1x107.9g+1x35.5g=143.4g/molAgCl
1molAgCl
0.0688gAgClx
= 0.000480molAgClor4.80x10-4
143.4gAgCl
7c.MolarMass=2x35.5g=71.0g/molCl2
1molCl2
79.3gCl2x
= 1.12molCl2
71.0gCl2
1molH 6.02x10 23 atomsH
8a.5.00gHx
x
= 3.01x1024atomsH
1.0gH
1molH
8b.187gAlx
1molAl 6.02x10 23 atomsAl
x
= 4.17x1024atomsAl
27.0gAl
1molAl
1molN 6.02x10 23 atomsN
8c.333gNx
x
= 1.43x1025atomsN
14.0gN
1molN
1molS
32.1gS
9a.5.23x1018atomsSx
=2.79x10-4gS
x
23
6.02x10 atomsS 1molS
1molN
14.0gN
9b.1.50x1025atomsNx
=349gN
x
23
6.02x10 atomsN 1molN
1molCO
28.0gCO
9c.2.35x1024moleculesCOx
=109gCO
x
23
6.02x10 molecCO 1molCO
7-2PartII
22.4LBe
10a.0.720molBex
=16.1LBe
1molBe
22.4LH 2O
10b.1.7molH2Ox
= 38LH2O
1molH 2O
22.4LCO2
10c.0.333molCO2x
= 7.46LCO2
1molCO2
1molH 2
11a.67.2LH2x
= 3.00molH2
22.4LH 2
1molAl(OH )3
11b.18.7LAl(OH)3x
= 0.835molAl(OH)3
22.4LAl(OH )3
11c.333LCO2x
1molCO2
= 14.9molCO2
22.4LCO2
ALL
1molH 2O2 22.4LH 2O2
x
= 3.29LH2O2
34.0gH 2O2 1molH 2O2
1molO2
22.4LO2
12b.1.50x1023moleculesO2x
x
= 5.58LO2
23
6.02x10 molecO2 1molO2
1molN
22.4LN
12c.5.32x1025atomsNx
x
= 1980LN
23
6.02x10 atomsN 1molN
22.4LCO2
12d.6.30molCO2x
= 141LCO2
1molCO2
1molMg(OH )2 58.3gMg(OH )2
13a.6.72LMg(OH)2x
x
= 17.5gMg(OH)2
22.4LMg(OH )2 1molMg(OH )2
1molNe
20.2gNe
13b.5.9x1020atomsNex
x
= 0.020gNe
23
6.02x10 atomsNe 1molNe
17.0gOH
13c.17.0molOHx
= 289gOH
1molOH
1molH 2O
18.0gH 2O
13d.3.2x1023moleculesH2Ox
x
= 9.6gH2O
23
6.02x10 molecH 2O 1molH 2O
1molAl 6.02x10 23 atomsAl
14a.1.87LAlx
x
= 5.03x1022atomsAl
22.4LAl
1molAl
6.02x10 23 atomsNa
14b.0.560molNax
= 3.37x1023atomsNa
1molNa
1molN 6.02x10 23 atomsN
14c.3.33gNx
x
= 1.43x1023atomsN
14.0gN
1molN
12a.5.00gH2O2x