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

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

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

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

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.

The Mass of a Mole = g

Using Molar Mass 0 Converting from moles to mass:

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

Using Molar Mass 0 Converting from mass to moles:

Practice 0 Determine the number of moles in each of the following: g Ag g S

Practice 0 Determine the mass of each of the following: mol of Al mol of Si

Using Molar Mass 0 How many atoms are in each of the following samples? g Li g Pb g Hg

Using Molar Mass 0 What is the mass in grams of each of the following? x atoms Bi x atoms Mn x atoms He