Stoichiometry Review

What is the first step on solving stoichiometry problems?

• balance the chemical reaction

• unbalance the chemical reaction

• start solving by writing what is given

• panic, it really helps

2 H₂ + O₂ → 2 H₂O

How many grams of H₂O will be produced if I have 90 grams of O₂?

What is the first step to solve it?

• start with the mass of O₂

• start with the mass of H₂O

• start with the mole of H₂O

• start with the mole of O₂

2 H₂ + O₂ → 2 H₂O

How many grams of H₂O will be produced if I have 90 grams of O₂?

What is the next step to solve it?

• convert mass of H₂O to mole of H₂O

• convert mass of O₂ to mole of O₂

• convert mass of H₂O to mole of O₂

• convert mass of O₂ to mole of H₂O

2 H₂ + O₂ → 2 H₂O

How many grams of H₂O will be produced if I have 90 grams of O₂?

Now that we got the mole of O₂. What is the next step to solve it?

• convert mole of H₂O to mass of H₂O

• convert mole of O₂ to mass of O₂

• convert mole of H₂O to mole of O₂

• convert mole of O₂ to mole of H₂O

2 H₂ + O₂ → 2 H₂O

To convert mole of O₂ to mole of H₂O, what stoichiometric ratio should be used?

• 2 mol H₂ : 2 mol H₂O

• 2 mol H₂O : 1 mol O₂

• 2 mol H₂ : 1 mol O₂

2 H₂ + O₂ → 2 H₂O

How many grams of H₂O will be produced if I have 90 grams of O₂?

Now that we got the mole of H₂O What is the last step to solve it?

• convert mole of H₂O to mass of H₂O

• convert mole of O₂ to mass of O₂

• convert mole of H₂O to mole of O₂

• convert mole of O₂ to mole of H₂O

B₂H₆ + 3 O₂ → 2 HBO₂ + 2 H₂O

How many moles of water are produced form 19.2 g of B₂H₆?

How should we solve it?

• mole H₂O → mole of B₂H₆ → mass B₂H₆

• mass of B₂H₆ → mole B₂H₆ → mole H₂O

• mass of B₂H₆ → mole H₂O → mole B₂H₆ → mass H₂O

• mass of B₂H₆ → mole B₂H₆ → mole H₂O → mass H₂O

B₂H₆ + 3 O₂ → 2 HBO₂ + 2 H₂O

What mass of O₂ will be needed to burn 36.1 g of B₂H₆?

How should we solve it?

• mass of B₂H₆ → mole of B₂H₆ → mass of O₂ → mole of O₂

• mass of B₂H₆ → mole of B₂H₆ → mole of O₂ → mass of O₂

• mass of B₂H₆ → mole of O₂ → mole of B₂H₆ → mass of O₂

• mass of O₂ → mole of O₂ → mole of B₂H₆ → mass of B₂H₆