Drill Determine the molar mass of the following: NaCl H3PO4

Objective The student will be able to: Use dimensional analysis in order to interconvert between units of mass, moles, representative particles and volume of a gas at STP.

SAT/HSA Enrichment The molar mass of Ga(ClO3)3 is … 201.5 g/mol

JellyBeans Working within your group do you have any other ideas about how to determine the number of jellybeans in the jar? Take about 5 min to discuss! 5 MIN

KEY Questions for The UNIT! What is the basic unit for measuring numbers of particles? What is the relationship between particles and mass in a substance? How are chemical quantities determined? How do available materials limit the amount of products?

The MOLE! Mole Relationships!

Mole–Mass and Mole–Volume Relationships How can you guess the number of jelly beans in a jar? You estimate the size of a jelly bean and then estimate the dimensions of the container to obtain its volume. In a similar way, chemists use the relationships between the mole and quantities such as mass, volume, and number of particles to solve chemistry problems.

The Mole–Mass Relationship Use the molar mass of an element or compound to convert between the mass of a substance and the moles of a substance.

The Mole–Volume Relationship Avogadro’s hypothesis states that equal volumes of gases at the same temperature and pressure contain equal numbers of particles.

The Mole–Volume Relationship The volume of a gas varies with temperature and pressure. The volume of a gas is usually measured at a standard temperature and pressure. Standard temperature and pressure (STP) means a temperature of 0°C and a pressure of 101.3 kPa, or 1 atmosphere (atm).

The Mole–Volume Relationship At STP, 1 mol or, 6.02  1023 representative particles, of any gas occupies a volume of 22.4 L. The quantity 22.4 L is called the molar volume of a gas.

The Mole–Volume Relationship Calculating Molar Mass from Density

The Mole Road Map

The Mole Road Map

The Mole Road Map

The Mole Road Map Online Stimulation

Class Work Mole-Mass and Mole-Volume Relationship worksheet.

Small-Scale Lab Counting by Measuring Mass Purpose To determine the mass of several samples of chemical compounds and use the data to count atoms

Summary What is the mole? What is Avogadro’s number? The SI unit that measures the amount of substance is the mole. What is Avogadro’s number? (6.02 x 1023) What is the representative unit of an element? Atom

Summary What is the representative unit of molecule? What is the representative unit of an ionic compound? Formula unit Which would be used for the following gam, gfm, or gmm? Ne Gam NaCl Gfm O2 gmm