Presentation is loading. Please wait.

Presentation is loading. Please wait.

Episode 801 How many moles of water will be produced when 8 grams of hydrogen gas react with the oxygen in the air?

Similar presentations


Presentation on theme: "Episode 801 How many moles of water will be produced when 8 grams of hydrogen gas react with the oxygen in the air?"— Presentation transcript:

1 Episode 801 How many moles of water will be produced when 8 grams of hydrogen gas react with the oxygen in the air?

2 Stoichiometry Study of the quantity (mass) relationships in a chemical reaction Based on balanced equations 2Mg + O 2  2MgO Two atoms of magnesium reaction with 1 oxygen molecule to form 2 magnesium oxide formula units or Two moles of magnesium atoms react with 1 mole of oxygen molecules to form 2 moles of magnesium oxide formula units Episode 801

3 The coefficients in a balance equation give the MOLE RATIO for the substances involved in the reaction. – Example problem: – When elemental aluminum reacts with elemental iodine, aluminum iodide is produced. 2 Al + 3 I 2  2 AlI 3 Mole ratios:____Al:____I 2 ____Al:____AlI 3 ____I 2 :____AlI 3 If you start with 4 moles of Al, how many moles of AlI 3 will be produced? ? mol AlI 3 = 4 mol Al 2 mol Al 2 mol AlI 3 = 2 mol AlI 3 Episode 801

4 Problem Set 1 N 2 H 4 + N 2 O 4  N 2 + H 2 O BE SURE TO BALANCE THE EQUATION FIRST!! ? mol N 2 H 4 = 2.72 mol N 2 H 4 ? mol N 2 = 2.72 mol N 2 H mol N 2 H 4 2 mol N 2 H 4 1 mol N 2 O 4 = 1.36 mol N 2 O mol N 2 H 4 2 mol N 2 H 4 3 mol N 2 = 4.08 mol N 2 Episode 801

5 How many moles of water will be produced when 8 grams of hydrogen gas react with the oxygen in the air? (Hint: To “make the switch” between different substances in a reaction, use the mole ratio from the balanced equation.) 2 H 2 + O 2  2 H 2 O ? mol H 2 O = 8 g H 2 (Hint: We will need to change grams of H 2 to moles H 2 ) 2 g H 2 1 mol H 2 2 mol H 2 2 mol H 2 O = 4 mol H 2 O

6 Problem Set 2 In photosynthesis, carbon dioxide and water react to form glucose, C 6 H 12 O 6 and oxygen gas. If 15.6g of carbon dioxide react, how many moles of glucose will be produced? How many grams of carbon dioxide must react to form 0.25 moles of glucose? 6 CO H 2 O  C 6 H 12 O O 2 ? mol C 6 H 12 O 6 = 15.6g CO 2 44g CO 2 1 mol CO 2 6 mol CO 2 1 mol C 6 H 12 O 6 = mol C 6 H 12 O 6 ? g CO 2 = 0.25 mol C 6 H 12 O 6 1 mol C 6 H 12 O 6 6 mol CO 2 1 mol CO 2 44g CO 2 = 66g CO 2 Episode 801

7 Challenge Problem When nitrogen and hydrogen react, they form ammonia gas, which has the formula NH 3. If 56.0 g of nitrogen are used up in the reaction, how many grams of ammonia will be produced? Episode 801


Download ppt "Episode 801 How many moles of water will be produced when 8 grams of hydrogen gas react with the oxygen in the air?"

Similar presentations


Ads by Google