3 - Moles & Quantities

• find the number of moles of copper atoms in a copper pipe

  A) mass

  B) mass

  C) mole

  D) atoms

  
• number of (atoms/particles/molecules/elements) = number of moles x Avogadro's constant
• Avogadro's constant - the number of particles per mole of a substance
• Avogadro's constant - 6.02 x 10^23 mol^-1
• how many molecules are there in 3.15 moles of ammonia?

  3.15 x 6.02 x 10^23 molecules
• moles = mass x Mr