Module 3 - Lesson 4 Exercises Answer Key - Mr. Choy's...

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Chemistry 30S Module 3 - Lesson 4 Exercises Answer Key 1.

Compound Formula Molar Mass

sodium hydroxide NaOH 40.0 g/mol

barium nitrate Ba(NO3)2 261.3 g/mol

aluminum phosphate AlPO4 122.0 g/mol

magnesium hydrogen carbonate Mg(HCO3)2 146.3 g/mol

lithium sulphate Li2SO4 109.9 g/mol

strontium phosphate Sr3(PO4)2 452.8 g/mol

a. m = (2.50 mol)(40.0 g/mol) = 100. g b. m = (0.0250 mol)(261.3 g/mol) = 6.53 g c. m = (5.25 x 10-6 mol)(122.0 g/mol) = 6.41 x 10-4 g

d. 3 21 mol2.93 g 0.200 mol Mg(HCO )

146.3 gn

e. 2 41 mol27.5 g 0.250 mol Li SO

109.9 gn

f. 23 4 2

1 mol4.629 10 g 1.02 mol Sr (PO )452.8 g

n

2. a. 1 mol3.00 g 0.750 mol He4.0 g

n

b. 21 mol6.84 g 0.180 mol F38.0 g

n

c. 1 mol12.2 g 0.452 mol Al27.0 g

n

d. 1 mol33.5 g 0.600 mol Fe55.8 g

n


e. 21 mol4.40 g 0.100 mol CO44.0 g

n

f. 2423

1 mol3.612 10 atoms 6.00 mol O6.02 10 atoms

n

g. 2423

1 mol3.01 10 atoms 5.00 mol N6.02 10 atoms

n

h. 2323

1 mol2.41 10 atoms 0.400 mol Ba6.02 10 atoms

n

i. 232 423

1 mol9.03 10 molecules 1.50 mol H SO6.02 10 molecules

n

j. 23223

1 mol1.204 10 molecules 0.200 mol H O6.02 10 molecules

n

3. a. NaOH = 40.0 g/mol m = nM = (1.25 mol)(40.0 g/mol) = 50.0 g b. KCl = 74.6 g/mol m = (0.0500 mol)(74.6 g/mol) = 3.73 g c. Mg3(PO4)2 = 262.9 g/mol m = (0.450 mol)(262.9 g/mol) = 118.3 g d. HNO3 = 63.0 g/mol m = (2.20 mol)(63.0 g/mol) = 138.6 g e. NaNO3 = 85.0 g/mol m = (2.50 x 10-2 mol)(85.0 g/mol) = 2.13 g f. H2O = 18.0 g/mol

9 13223

1 mol 18.0 g4.75 10 molecules 1.42 10 g H O6.02 10 molecules 1 mol

m

g. P = 31.0 g/mol

2323

1 mol 31.0 g4.515 10 atoms 23.3 g P6.02 10 atoms 1 mol

m

h. NaCl = 58.5 g/mol

2323

1 mol 58.5 g1.50 10 molecules 14.6g NaCl6.02 10 molecules 1 mol

m

i. N2 = 28.0 g/mol

23223

1 mol 28.0 g3.01 10 molecules 14.0g N6.02 10 molecules 1 mol

m


j. SO3 = 80.1 g/mol

20323

1 mol 80.1 g500 molecules 6.65 10 g SO6.02 10 molecules 1 mol

m

4. a. part = (1.20 x 10-15 mol)(6.02 x 1023 part/mol) = 7.22 x 108 particles Zn b. part = (4.50 x 10-7 mol)(6.02 x 1023 part/mol) = 2.71 x 1017 particles Sn c. part = (5.75 mol)(6.02 x 1023 part/mol) = 3.46 x 1024 particles Pb d. part = (1.41 mol)(6.02 x 1023 part/mol) = 8.49 x 1023 particles H2O e. part = (3.72 x 10-21 mol)(6.02 x 1023 part/mol) = 2.24 x 103 particles LiOH f. Al = 27.0 g/mol

23

231 mol 6.02 10 atoms16.2 g 3.61 10 atoms Al27.0 g 1 mol

part

g. Ca = 40.1 g/mol

23

231 mol 6.02 10 atoms60.5 g 9.08 10 atoms Ca40.1 g 1 mol

part

h. HNO3 = 63.0 g/mol

23

223

1 mol 6.02 10 molecules6.31 g 6.03 10 molecules HNO63.0 g 1 mol

part

i. SO2 = 64.1 g/mol

23

10 122

1 mol 6.02 10 particles1.10 10 g 1.03 10 particles SO64.1 g 1 mol

part

j. Al2O3 = 102.2 g/mol

23

232 3

1 mol 6.02 10 particles25.5 g 1.50 10 particles Al O102.2 g 1 mol

part

5. a. K = 39.1 g/mol

23 2323

1 mol 39.1 g1 atom 6.495 10 g K 6.50 10 g K6.02 10 atoms 1 mol

mass


b. CuSO4 = 159.6 g/mol

21423

1 mol 159.6 g5 molecules 1.33 10 g CuSO6.02 10 molecules 1 mol

mass

c. P2O5 = 142.0 g/mol

212 523

1 mol 142.0 g10 molecules 2.36 10 g P O6.02 10 molecules 1 mol

mass

6. a. (NH4)2SO4 = 132.1 g/mol

4 2 41 mol75.6 g 0.572 mol (NH ) SO

132.1 gn

b. 23

234 2 4

6.02 10 particles0.572 mol 3.45 10 molecules (NH ) SO1 mol

part

c. 4 2 44 2 4

2 Nmoles N = 0.572 mols (NH ) SO 1.14 mol N1 (NH ) SO

d.

2324

4 2 44 2 4

8 H 6.02 10 atomsatoms H = 0.572 mols (NH ) SO 2.76 10 atoms H1 (NH ) SO 1 mol

7. a. 22

2 Hmoles H = 2.5 mols H O 5.0 mol H1 H O

moles O = moles H2O = 2.5 moles O b.

5 53 4 2

3 4 2

3 Mgmoles Mg = 1.5 10 mols Mg (PO ) 4.5 10 mol Mg1 Mg (PO )

5 53 4 2

3 4 2

2 Pmoles P = 1.5 10 mols Mg (PO ) 3.0 10 mol P1 Mg (PO )

5 43 4 2

3 4 2

8 Omoles O = 1.5 10 mols Mg (PO ) 1.2 10 mol O1 Mg (PO )

c. 4 34 3

2 Nmoles N = 5.00 mols NH NO 10.0 mol N1 NH NO

4 34 3

4 Hmoles H = 5.00 mols NH NO 20.0 mol H1 NH NO

4 34 3

3 Omoles O = 5.00 mols NH NO 15.0 mol O1 NH NO


d. CaCO3 = 100.1 g/mol

3

1 mol 1 Ca mol Ca 10.0 g 0.0999 mol Ca100.1 g 1 CaCO

3

1 mol 1 C mol C 10.0 g 0.0999 mol C100.1 g 1 CaCO

3

1 mol 3 O mol O 10.0 g 0.2997 mol O 0.300 mol O100.1 g 1 CaCO

e. Ba(OH)2 = 171.3 g/mol

2

1 mol 1 Ba mol Ba 50.0 g 0.292 mol Ba171.3 g 1 Ba(OH)

2

1 mol 2 O mol O 50.0 g 0.584 mol O171.3 g 1 Ba(OH)

2

1 mol 2 H mol H 50.0 g 0.584 mol H171.3 g 1 Ba(OH)

8. a. 23

242

2

2 H 6.02 10 atomsatoms H = 2.5 mols H O 3.01 10 atoms H1 H O 1 mol

moles O = moles H2O = 2.5 moles O atoms O = (2.5 mol)(6.02 x 1023 atoms/mol) = 1.51 x 1024 atoms O b.

235 19

3 4 23 4 2

3 Mg 6.02 10 atomsatoms Mg = 1.5 10 mols Mg (PO ) 2.71 10 atoms Mg1 Mg (PO ) 1 mol

235 19

3 4 23 4 2

2 P 6.02 10 atomsatoms P = 1.5 10 mols Mg (PO ) 1.81 10 atoms P1 Mg (PO ) 1 mol

235 19

3 4 23 4 2

8 O 6.02 10 atomsatoms O = 1.5 10 mols Mg (PO ) 7.22 10 atoms O1 Mg (PO ) 1 mol

c.

2324

4 34 3

2 N 6.02 10 atomsatoms N = 5.00 mols NH NO 6.02 10 atoms N1 NH NO 1 mol

2324

4 34 3

4 H 6.02 10 atomsatoms H = 5.00 mols NH NO 1.20 10 atoms H1 NH NO 1 mol

23

244 3

4 3

3 O 6.02 10 atomsatoms O = 5.00 mols NH NO 9.03 10 atoms O1 NH NO 1 mol


d. CaCO3 = 100.1 g/mol

2322

3

1 mol 1 Ca 6.02 10 atoms atoms Ca 10.0 g 6.01 10 atoms Ca100.1 g 1 CaCO 1 mol

2322

3

1 mol 1 C 6.02 10 atoms atoms C 10.0 g 6.01 10 atoms C100.1 g 1 CaCO 1 mol

2323

3

1 mol 3 O 6.02 10 atoms atoms O 10.0 g 1.80 10 atoms O100.1 g 1 CaCO 1 mol

e. Ba(OH)2 = 171.3 g/mol

23

23

2

1 mol 1 Ba 6.02 10 atomsatoms Ba 50.0 g 1.76 10 atoms Ba171.3 g 1 Ba(OH) 1 mol

2323

2

1 mol 2 O 6.02 10 atomsatoms O 50.0 g 3.52 10 atoms O171.3 g 1 Ba(OH) 1 mol

23

23

2

1 mol 2 H 6.02 10 atomsatoms H 50.0 g 3.52 10 atoms H171.3 g 1 Ba(OH) 1 mol

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