Moles and Stoich

Wordle

100

This number equaling 6.02x10²³ represents the amount of particles/atoms/molecules in a mole.

Avogadro's number

200

This is a way to deal with the mass relationships of elements in compounds as well as reactants and products.

Stoichiometry

300

This is going from one unit to another, with units cancelling.

Factor labeling

400

The amount of grams in one mole.

Molar mass

500

What is the formula for mass %?

mass of element/total mass x100

MOL or Nothing!

100

You are given: 13.5 mol Al₂(CO₃)₃ and wanted that amount of grams.

3159 g

200

You are given: 12.8 g MnSO₄ and want it in particles.

5.103 x 10²² particles

300

What is the molar mass of potassium phosphate?

212.27 g/mol

400

What is the percent composition by mass of strontium in SrO?

84.56% Sr

500

4 Si₂H₃ + 11 O₂ → 8 SiO₂ + 6 H₂O

4.94 grams of O₂ are reacted, how many grams of SiO₂ that will be produced.

6.7 grams SiO₂

Buying in Bulk

100

To go from one mole to another we use the...

mole bridge

200

This is the reactant the runs out first and causes the reaction to stop.

limiting reactant

300

This is the reactant that does not run out.

excess reactant

400

3 Mg + N2 → Mg3N2

0.3557 moles of Mg are reacted, this is how many grams of Mg3N2 will be produced.

11.97 grams Mg3N2

500

Fe₂O₃ + 3 H₂SO₄ → Fe₂(SO₄)₃ + 3 H₂O

176.33 grams of Fe2O3 are reacted, this is how many grams of Fe2(SO4)3 will be produced.

441.55 grams Fe₂(SO₄)₃

The Old College Try

100

This is the formula for % yield.

(actual/theoretical) x 100

200

This is a counting unit in chemistry.

Mole

300

How many miles are in 10 meters?

6.21 x 10^-3 miles

400

Cu₂O + O₂ →  2 CuO

If 15.63 grams of CuO are produced, but the theoretical was 23.95 g of CuO, what is the percent yield of the reaction?

Correct answer is 65.27%

500

2 Al + Fe₂O₃ → 2 Fe + Al₂O₃
23.32 grams Al to form 30.24 grams of Fe. What is the % yield.

Correct answer is 62.65%
• 100% yield would be 48.27 grams Fe