1. Chapter 10 Chemical Quantities
10.1 The Mole: A Measurement of Matter
10.2 Mole-Mass and Mole-Volume Relationships
10.3 Percent Composition and Chemical Formulas
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2. The Mole-Mass Relationship
Do Now:
What is the mass of one mole of Iodine?
What is the molar mass of C2H6?
What is the molar mass of Mg(NO2)2?
What is the mass of 15.3 moles of NaCl?
What is the mass of 9.4 x 1024 atoms of Nickel?
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3. The Mole-Mass Relationship
Molar mass is used to convert between mass and moles.
molar mass = 1 mol
molar mass
1 mol
and
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4. Converting Moles to Mass
Sample Problem 10.5
Converting Moles to Mass
1. What is the mass, in grams, of 2.1 moles of Al?
2. What is the mass, in grams of 2.1 moles of AlCl3
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5. Converting Mass to Moles
Sample Problem 10.6
Converting Mass to Moles
How many moles are in 0.37 g of boron?
How many moles are in 75 g of dinitrogen trioxide?
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6. The Mole-Mass Relationship
Do Now:
How many moles of NaCl are in 100. grams of NaCl?
How many molecules of CO2 are in 100. grams of CO2?
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7. The Mole-Mass Relationship
Do Now:
Table sugar, or sucrose, has the chemical formula C12H22O11.
1 teaspoon of sugar has a mass of 4.2 grams. How many moles of sugar molecules are in 1 teaspoon of sugar?
How many sugar molecules are in 1 teaspoon of sugar?
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8. The Mole-Volume Relationship
Avogadro’s Hypothesis
At STP, 1 mol of any gas occupies 22.4 L.
STP - Standard temperature & pressure
0°C and kPa, or 1 atmosphere (atm).
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9. The Mole-Mass Relationship
Molar volume of a gas can be used to convert between volume and moles.
molar volume of a gas = 22.4 L = 1 mol
22.4 L
1 mol
and
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10. The Mole-Volume Relationship
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11. Calculating Gas Quantities at STP
Sample Problem 10.7
Calculating Gas Quantities at STP
Determine the volume, in liters, of 3.7 mol N2 gas at STP.
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12. Calculating Gas Quantities at STP
Sample Problem 10.7
Calculating Gas Quantities at STP
Determine the number of moles of SO2 in 67.2 L SO2, at STP.
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13. The Mole-Volume Relationship
Calculating Molar Mass and Density
Density and molar volume at STP can be used to calculate molar mass of a gas.
Molar mass = Density * Molar Volume
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14. Calculating the Molar Mass of a Gas at STP
Sample Problem 10.8
Calculating the Molar Mass of a Gas at STP
A gaseous compound containing sulfur and oxygen has a density of 3.58 g/L at STP. What is the molar mass of the compound?
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15. END OF 10.2
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