Section 3: Mass and the MoleChapter 7: Chemical Composition

Learning Goals0Convert between grams and moles.

0Find molar mass of an element.

The Mass of a Mole0Do 12 large nails have the same mass as 12 small nails?

The Mass of a Mole0Does 1 mol of sulfur have the same mass as 1 mol of carbon?

The Mass of a Mole0Molar mass is the mass in grams of one mole of any pure substance.

0The molar mass of any element is numerically equivalent to its atomic mass and has the units g/mol.

The Mass of a Mole

= 55.845 g

Using Molar Mass0Converting from moles to mass:

Using Molar Mass0What is the mass of 3.00 moles of copper?

Using Molar Mass0Converting from mass to moles:

Practice0Determine the number of moles in each of the following:025.5 g Ag0300.0 g S

Practice0Determine the mass of each of the following:03.57 mol of Al042.6 mol of Si

Using Molar Mass0How many atoms are in each of the following samples?055.2 g Li00.230 g Pb011.5 g Hg

Using Molar Mass0What is the mass in grams of each of the following?06.02 x 1024 atoms Bi01.00 x 1024 atoms Mn03.40 x 1022 atoms He