The Mole

Measuring Matter

100

which is the number of representative particles in a mole, and can be rounded to 3 significant digits 6.02x10^23 called?

Avogadro's Number

200

0.595mol ZnCl2 a formula unit; Moles to Particles 

3.58x10^23ZnCl2

300

What is the SI base unit used to measure the amount of a substance?

Mole

400

Calculate the number of oxygen atoms in 5.0 mol of oxygen molecules. 

Reminder: Oxygen is a diatomic molecule,O2.

6.02x10^24

500

How is this number written when rounded to 3 significant digits: 602,213,670,000,000,000,000,000?

6.02x10^23

Mass and the Mole

100

When converting mass to moles, what conversion factor do you use?

The inverse molar mass

200

What is the mass in grams of one mole of any pure substance?

Molar Mass

300

What is the formula for converting moles to mass?

number of moles x mass in grams/1 mole=mass

400

Solve) Moles to mass: 42.6 mol Si

1.20x10^3g Si

500

Solve:

 Mass to Atoms: 

a. 55.2g Li 

b. 11.5g Hg

a. 4.79x10^24 atoms Li 

b. 3.45x10^22 atoms Hg

Moles of Compounds

100

What is the mass of 4.35x10^-2 mol of zinc chloride(ZnCl2)?

5.93g

200

What do chemical formulas indicate in one unit of the compound?

the number and types of atoms contained

300

Mass of a compound to moles. 6.50g ZnSO4

0.0403mol

400

What does the molar mass of a compound demonstrates?

Hint: it's a law

The law of conservation of mass

500

A sample of carbon dioxide (CO2) has a mass of 52.0g. How many oxygen atoms are present?

1.42x10^24 O atoms

Empirical and Molecular

100

What is the percent composition of phosphoric acid (H3PO4)?

3.08%H, 31.61%P, 65.31%O

200

What is the percent by mass of each element in a compound?

Percent Composition

300

What is the empirical formula for a compound that contains 26.1% carbon, 4.3% hydrogen and 69.6 % oxygen?

CH₂O₂

400

A compound with an empirical formula of CH has a molecular weight of 78g/mol. What is the molecular formula?

C6H6, the formula for benzene

500

What is the empirical formula of 43% C and 57% O?

CO

Formulas of Hydrates

100

What is the name of this chemical formula? 

Na2 SO4 x 10H20

sodium sulfate decahydrate

200

What is the chemical formula? 

sodium acetate trihydrate

NaC2H3O2 x 3H2O

300

What is a compound that has a specific number of water molecules bound to its atom?

Hydrate

400

Name the following compound:

FeCl3 . 6 H2O

Iron (III) Chloride x Hexahydrate

500

What are formed when hydrates are heated?

Anhydrous Compounds