Mole & Mass Relationships in Chemical Reactions

Question 1

Ratios in a reaction

Answer 1

• The coefficients tell us the ratio of the reaction
• Ratios are in the order of the equations
• Ratios/coefficients are known as moles/mole ratio

Question 2

Using mole ratios

Answer 2

• Amount= moles
• Molar mass uses compound not element
• Mole ratios can only be used with moles not mass
• Mass should be converted to moles
• Want over Have ratio

Question 3

Mass instead of moles were given

Answer 3

• mass of given subtance –> amount of given subtance (mol)
  (use molar mass of given subtance)
• amount of given subtance (mol) –> amount of required subtance (mol)
  (use mole ratio)
• amount of required subtance (mol) –> mass of required subtance
  (use molar mass of required subtance)

Question 4

Stoichiometric Amount

Answer 4

• Completely using up the recants will make it stoichiometric amounts
• A stoichiometric amount is an amount of reactants that is in the same proportion as the reactant coefficients in the balanced chemical equation
• Exact amount without anything left over
• Has to be EXACTLY the number in chemical equation
• Only uses mole ratios