Mole definition

• How is a mole similar to a dozen?

  Both are fixed quantities for counting items.
• What is the definition of a mole?

  A mole is a fixed number of particles.
• In the formula $n =$$\frac{m}{M}$, what does $M$ represent?


  Molar mass in g/mol
• What is the number of moles for 32 grams of oxygen?

  • Molar mass of oxygen: 32 g/mol
  • Calculation: $n =$$\frac{32}{32} =$$1$ mol
• What is the number of moles for 12 grams of carbon?

  • Molar mass of carbon: 12 g/mol
  • Calculation: $n =$$\frac{12}{12} =$$1$ mol
• Why is Avogadro's number significant in chemistry?

  • Makes counting particles manageable
  • Allows comparison of amounts of substances
  • Facilitates chemical reactions and calculations
• How do you calculate moles from grams using molar mass?

  • Identify the substance's molar mass.
  • Use the formula: $n =$$\frac{m}{M}$
  • Substitute the mass in grams for $m$ and molar mass for $M$.
  • Solve for $n$ (number of moles).
• How do you calculate the number of moles from mass and molar mass?

  Divide mass in grams by molar mass
• How many moles are in 36 g of water with a molar mass of 18 g/mol?

  2 moles
• What is the unit of measurement for the mole?

  mol
• How does a mole compare to a dozen?

  A mole has 6.022 x 10²³ particles
• What is Avogadro's number?

  6.022 x 10$^{23}$
• In the formula $n =$$\frac{m}{M}$, what does $n$ represent?


  Number of moles
• How does a mole simplify counting particles?

  It allows counting vast numbers easily.
• How many particles are in one mole of hydrogen atoms?

  6.022 x 10²³ atoms
• How many moles are in 4 g of hydrogen with a molar mass of 2 g/mol?

  2 moles
• What is the significance of the mole in chemistry?

  • Allows easy comparison of chemical amounts
  • Facilitates calculations involving reactions
  • Provides a standard for measuring particles
• In the formula $n =$$\frac{m}{M}$, what does $m$ represent?


  Mass in grams
• How many hydrogen atoms are in 2 moles of hydrogen?

  12.044 x 10$^{23}$ hydrogen atoms
• What is Avogadro's number?

  Avogadro's number is $6.022 \times 10^{23}$.
• How can you convert grams to moles if you know the molar mass?

  Use the formula $n =$$\frac{m}{M}$
• What is the number of moles for 28 grams of nitrogen?

  • Molar mass of nitrogen: 28 g/mol
  • Calculation: $n =$$\frac{28}{28} =$$1$ mol
• What is the formula to calculate the number of moles?

  $n =$$\frac{m}{M}$
• What does Avogadro's number represent?

  Number of particles in one mole
• What does the unit g/mol represent?

  Molar mass for converting mass and moles