1. Section 3: Mass and the Mole Chapter 7: Chemical Composition

2. Learning Goals 0 Convert between grams and moles. 0 Find molar mass of an element.

3. The Mass of a Mole 0 Do 12 large nails have the same mass as 12 small nails?

4. The Mass of a Mole 0 Does 1 mol of sulfur have the same mass as 1 mol of carbon?

6. The Mass of a Mole 0 Molar mass is the mass in grams of one mole of any pure substance. 0 The molar mass of any element is numerically equivalent to its atomic mass and has the units g/mol.

7. The Mass of a Mole = 55.845 g

8. Using Molar Mass 0 Converting from moles to mass:

9. Using Molar Mass 0 What is the mass of 3.00 moles of copper?

10. Using Molar Mass 0 Converting from mass to moles:

12. Practice 0 Determine the number of moles in each of the following: 0 25.5 g Ag 0 300.0 g S

13. Practice 0 Determine the mass of each of the following: 0 3.57 mol of Al 0 42.6 mol of Si

14. Using Molar Mass 0 How many atoms are in each of the following samples? 0 55.2 g Li 0 0.230 g Pb 0 11.5 g Hg

15. Using Molar Mass 0 What is the mass in grams of each of the following? 0 6.02 x 10 24 atoms Bi 0 1.00 x 10 24 atoms Mn 0 3.40 x 10 22 atoms He