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Molar Mass Worksheet and Key For the following compounds, write the chemical formula and determine the molar mass. O 1 16.00 g/mole Total MM = 18.02 g/mole carbon dioxide, 2CO 2 Element Number MM O 2 16.00 g/mole C 1 12.01 g/mole Total MM = 44.01 g/mole sodium chloride, NaCl Element Number MM. Microsoft Word - wsmolarmass.docx.
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Worksheet: Mole Problems
Name______________ KEY
Part 1: Molar Mass Use the periodic table to find the molar masses of the following. HCl K2CO3 2(39.1 g/mol) + 12.0 g/mol + 3(16.0 g/mol)= 138.2 g/mol
1.0 g/mol + 35.5 g/mol = 36.5 g/mol
Ca(OH)2
Na3PO4
40.1 g/mol + 2(16.0 g/mol) + 2(1.0 g/mol) = 74.1 g/mol
3(23.0 g/mol) + 31.0 g/mol + 4(16.0 g/mol) = 164.0 g/mol
Part 2: Mole Conversions Work each of the following problems. SHOW ALL WORK. 1. How many atoms are in 6.2 moles of aluminum? ? atoms Al = 6.2 mol Al !
6.02 ! 10 23 atoms Al = 3.7 ! 10 24 atoms Al 1 mol Al
2. Convert 5.3 x 1025 molecules of CO2 to moles. ? moles CO2 = 5.3 ! 10 25 molecules CO2 !
1 mole CO2 6.02 ! 10 23 molecules CO2
= 88 mol CO2
3. How many formula units of sodium acetate are in 0.87 moles of sodium acetate? ? f.u. NaC2 H 3 O2 = 0.87 mol NaC2 H 3 O2 !
6.02 ! 10 23 f.u. NaC2 H 3 O2 = 5.2 ! 10 23 f.u. NaC2 H 3 O2 1 mol NaC2 H 3 O2
4. Convert 3.55 moles NaCl to formula units. ? f.u. NaCl = 3.55 mol NaCl !
6.02 ! 10 23 f.u. NaCl = 2.14 ! 10 24 f.u. NaCl 1 mol NaCl
CHEMISTRY: A Study of Matter © 2004, GPB
7.6a
5. Convert 3.00 moles As2S3 to grams. ? g As2 S3 = 3.00 mol As2 S3 !
246.1 g As2 S3 = 738 g As2 S3 1 mol As2 S3
6. How many moles are represented by 11.5 g of C2H5OH? ? mol C2 H 5 OH = 11.5 g C2 H 5 OH !
1 mol C2 H 5 OH = 0.250 mol C2 H 5 OH 46.0 g C2 H 5 OH
7. What is the mass of 9.30 moles of SiH4? ? g SiH 4 = 9.30 mol SiH 4 !
32.1 g SiH 4 = 299 g SiH 4 1 mol SiH 4
8. Convert 8.00 x 1020 molecules of H2 to moles. ? mol H 2 = 8.00 ! 1020 molecules H 2 !
1 mol H 2 6.02 ! 1023 molecules H 2
= 1.33 ! 10-3 mol H 2
9. How many atoms of tin are found in 3.50 moles of tin? ? atoms Sn = 3.50 mol Sn !
6.02 ! 1023 atoms Sn = 2.11 ! 1024 atoms Sn 1 mol Sn
10. How many grams of tin are found in 3.50 moles of tin? ? g Sn = 3.50 mol Sn !
118.7 g Sn = 415 g Sn 1 mol Sn
Bonus: How many atoms of hydrogen are found in 12.6 moles of water? ? atoms H = 12.6 mol H 2 O !
6.02 ! 10 23 molecules H 2 O 2 atoms H ! = 1.52 ! 10 25 atoms H 1 mol H 2 O 1 molecule H 2 O
CHEMISTRY: A Study of Matter © 2004, GPB
7.6b
Name______________ KEY
Part 1: Molar Mass Use the periodic table to find the molar masses of the following. HCl K2CO3 2(39.1 g/mol) + 12.0 g/mol + 3(16.0 g/mol)= 138.2 g/mol
1.0 g/mol + 35.5 g/mol = 36.5 g/mol
Ca(OH)2
Na3PO4
40.1 g/mol + 2(16.0 g/mol) + 2(1.0 g/mol) = 74.1 g/mol
3(23.0 g/mol) + 31.0 g/mol + 4(16.0 g/mol) = 164.0 g/mol
Part 2: Mole Conversions Work each of the following problems. SHOW ALL WORK. 1. How many atoms are in 6.2 moles of aluminum? ? atoms Al = 6.2 mol Al !
6.02 ! 10 23 atoms Al = 3.7 ! 10 24 atoms Al 1 mol Al
2. Convert 5.3 x 1025 molecules of CO2 to moles. ? moles CO2 = 5.3 ! 10 25 molecules CO2 !
1 mole CO2 6.02 ! 10 23 molecules CO2
= 88 mol CO2
3. How many formula units of sodium acetate are in 0.87 moles of sodium acetate? ? f.u. NaC2 H 3 O2 = 0.87 mol NaC2 H 3 O2 !
6.02 ! 10 23 f.u. NaC2 H 3 O2 = 5.2 ! 10 23 f.u. NaC2 H 3 O2 1 mol NaC2 H 3 O2
4. Convert 3.55 moles NaCl to formula units. ? f.u. NaCl = 3.55 mol NaCl !
6.02 ! 10 23 f.u. NaCl = 2.14 ! 10 24 f.u. NaCl 1 mol NaCl
CHEMISTRY: A Study of Matter © 2004, GPB
7.6a
5. Convert 3.00 moles As2S3 to grams. ? g As2 S3 = 3.00 mol As2 S3 !
246.1 g As2 S3 = 738 g As2 S3 1 mol As2 S3
6. How many moles are represented by 11.5 g of C2H5OH? ? mol C2 H 5 OH = 11.5 g C2 H 5 OH !
1 mol C2 H 5 OH = 0.250 mol C2 H 5 OH 46.0 g C2 H 5 OH
7. What is the mass of 9.30 moles of SiH4? ? g SiH 4 = 9.30 mol SiH 4 !
32.1 g SiH 4 = 299 g SiH 4 1 mol SiH 4
8. Convert 8.00 x 1020 molecules of H2 to moles. ? mol H 2 = 8.00 ! 1020 molecules H 2 !
1 mol H 2 6.02 ! 1023 molecules H 2
= 1.33 ! 10-3 mol H 2
9. How many atoms of tin are found in 3.50 moles of tin? ? atoms Sn = 3.50 mol Sn !
6.02 ! 1023 atoms Sn = 2.11 ! 1024 atoms Sn 1 mol Sn
10. How many grams of tin are found in 3.50 moles of tin? ? g Sn = 3.50 mol Sn !
118.7 g Sn = 415 g Sn 1 mol Sn
Bonus: How many atoms of hydrogen are found in 12.6 moles of water? ? atoms H = 12.6 mol H 2 O !
6.02 ! 10 23 molecules H 2 O 2 atoms H ! = 1.52 ! 10 25 atoms H 1 mol H 2 O 1 molecule H 2 O
CHEMISTRY: A Study of Matter © 2004, GPB
7.6b