Mole Concept

Particle Olympics

100

This mass unit is used for atomic particles and is defined as 1/12th the mass of a Carbon-12 atom.

What is universal atomic mass unit (amu)?

200

This particle weighs 1.0073 amu.

What is a proton?

300

Name the formula for finding the mass of a compound.

Atomic mass = Σ(# of atoms × atomic mass of that element).”

400

Number of particles =?

# of moles × Avogadro’s number

500

What is the equality of grams and amu?

1 amu = 1.66 × 10−24 g

Mole-y Moles

100

What is a mole?

A mole is a unit used to count a large amount particles like atoms, compounds, or ions.

One mole of substance equals 6.022 × 10²³ particles, which is known as Avogadro's number.

200

What is the molar mass of an element?

Molar mass is the mass of one mole of a substance in grams. The units are g/mol

300

What is the molar mass of H₂O to three decimal places?

18.015 g/mol

400

One mole of an element has a mass equal to this, in g/mol.

Atomic Mass or Molecular Mass

500

What is the molar mass of H₃PO₄?

98 g/mol

Formula Problems

100

What is the atomic mass of Oxygen?

16.00 amu

200

How many particles are in 3 mol glucose?

3 × 6.022×10²³ = 1.8066×10²⁴ molecules of glucose

400

Find the empirical formula of a compound that’s 48.64% C, 8.16% H, and 43.20% O.

C₃H₆O₂

500

Find the mass in grams of 2.00 x 10²³ molecules of F₂.

12.7 g 

Empirical vs Molecular Drama

100

This formula shows the simplest whole-number ratio of atoms.

What is the empirical formula?

200

Give the empirical formula of acetic acid (C₂H₄O₂).

CH₂O.

300

State the difference between empirical and molecular formulas.

Empirical formula shows the smallest whole number ration of a compound, while molecular formula shows the actual number of each element in the compound.

400

What are the steps to find the molecular formula of a compound?

1.Find the molar mass of the compound.

2.Calculate the empirical formula mass, EFM.

3.Divide the molar mass by the EFM to the nearest whole number.

4.Multiply all subscripts in the empirical formula by the quotient.

500

A compound has empirical formula CH₂O and molar mass 180 g/mol, what is its molecular formula?

C₆H₁₂O₆

Mole Madness

100

What is Percent Composition?

Percent composition refers to the percentage by mass of each element in a compound. 

200

What is Molarity?

Molarity is the measure of the concentration of moles of a substance in a solution.

300

Give the formula for percent composition.

Percent composition = ((mass of element in 1 mol of compound)/(molecular mass of compound)) x 100%

400

What is the formula for Molarity?

M = (moles of solute)/(litres of solution) = mol/L

500

What percentage by mass of potassium is in KMnO₄?

34.8%