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Convert mass and moles using m = n × M

Quantitative chemistry • Concentration of solutions

Key concepts

What you'll likely be quizzed about

  • A mole is defined as 6.02 x 10^23 particles, known as Avogadro's number.
  • Molar mass (M) is the mass of one mole of a substance, measured in grams per mole (g mol-1).
  • Elemental molar mass is derived from relative atomic masses given in the periodic table, while the molar mass of compounds is calculated by summing the atomic masses of each atom in the molecule.

Flashcards

Test your knowledge with interactive flashcards

What is the mass of 0.100 mol of CO2 (molar mass 44.01 g mol-1)?

Click to reveal answer

The mass equals 0.100 × 44.01 = 4.401 g.

Key notes

Important points to keep in mind

Convert mass to grams when using molar mass in g mol-1.

Use n = m ÷ M to find moles and m = n × M to find mass.

Calculate molar mass by summing atomic masses from the periodic table.

Ensure units cancel correctly; g ÷ (g mol-1) gives mol.

Convert kg to g by multiplying by 1000 and mg to g by dividing by 1000.

Maintain consistent significant figures; the final answer reflects the least precise input.

Use scientific notation for large or small masses or mole amounts.

Label answers with correct units: mass in g, amount in mol.

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