Tuesday January 29, 2013 (Mole to Mole Stoichiometry)

Bell Ringer Tuesday, In the following reaction, 5 moles of hydrogen gas will produce how many moles of water? H 2 + O 2 æ H 2 O 22 5 moles ? moles Hydrogen gas and water are in a 2:2 or 1:1 mole ratio, therefore 5 moles of hydrogen gas will produce 5 moles of water.

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Assignment Currently Open Summative or Formative? Date Issued Date Due Date Into GradeSpeed Final Day QUIZ 15S51/111/15TODAY QUIZ 16S11/18 1/242/7 WS - Introduction to Stoichiometry and Mole Ratios F71/232/1 WS – Review of Molar Mass F81/242/1 Project Share Quiz – Reactions and Balancing F91/25 2/1

Types of Stoichiometry Problems Mole – Mole Conversions: The given and unknown quantities are both amounts in moles. When you are given the amount of a substance in moles and asked to calculate the amount in moles of another substance in the chemical reaction, the general plan is:

Example: 13 moles of aluminum oxide will produce how many moles of aluminum? 2Al 2 O 3 → 4Al + 3O 2 Mole ratio of Al 2 O 3 to Al: 2:4 1:2 13 mol Al 2 O 3 → 26 mol Al Mole – Mole Conversions

Mole - Mole Stoichiometry Mole - mole stoichiometry enables you calculate the number of moles of a substance that is a reactant or a product in a reaction if you know the number of moles of another substance in the same reaction.

Magnesium metal reacts with oxygen gas to produce magnesium oxide. If 5 moles of magnesium metal react, how many moles of magnesium oxide will be produced? First, write the balanced chemical equation. Mg + O 2 æ MgO Using the formula for mole – mole conversions, the calculation would look like this: Mole - Mole Stoichiometry Sample Problem 22 5 mol Mg 1 X 2 mol Mg =mol MgO 2 5

In the space shuttle, the carbon dioxide exhaled by astronauts has to be removed to prevent the crew from suffocating. Carbon dioxide can be removed by its reaction with lithium hydroxide to produce lithium carbonate and water, which are not harmful to the astronauts. Write the balanced chemical equation for the reaction, then determine how many moles of lithium hydroxide are required to react with 20 mol of carbon dioxide, the average amount exhaled by each crew member each day? Mole - Mole Stoichiometry Sample Problem CO 2 + LiOH æ Li 2 CO 3 + H 2 O 2 20 mol? mol

Mole - Mole Stoichiometry Sample Problem CO 2 + LiOH æ Li 2 CO 3 + H 2 O 2 20 mol? mol 20 mol CO 2 X = 11mol CO 2 mol LiOH 2 40

Worksheet Mole to Mole Stoichiometry