Stoichiometry and cooking with chemicals

 Interpret a balanced equation in terms of moles, mass, and volume of gases.  Solve mole-mole problems given reactants and products

STOICHIOMETRY “The calculation of quantities in chemical reactions.” 1 molecule + 3 molecules 2 molecules H H H N H H N N H H H H H H H N N 2 (g) + 3 H 2 (g) 2 NH 3 (g)

22.4 L 22.4 L 22.4 L 22.4 L 22.4 L 22.4 L + 28g + 6g 34g Only the mass and atoms are conserved in every chemical reaction. 1 mole + 3 moles 2 moles N 2 (g) + 3 H 2 (g) 2 NH 3 (g)

1 N 2 : 3 H 2 1 N 2 : 2 NH 3 Molar Ratio H H H N H H N N H H H H H H H N N 2 (g) + 3 H 2 (g) 2 NH 3 (g) 1 N 2 3 H 2 1 N 2 2 NH 3 3 H 2 1 N 2

How many moles of H 2 are used with a) 2 mol N 2 b) 0.5 mol N 2 2 mol N 2 1 mol N 2 3 mol H 2 = 6 mol H 2 N 2 (g) + 3 H 2 (g) 2 NH 3 (g) 0.5 mol N 2 1 mol N 2 3 mol H 2 = 1.5 mol H 2

How many moles of ammonia gas can be made from moles of hydrogen gas? N 2 (g) + 3 H 2 (g) 2 NH 3 (g) mol H 2 3 mol H 2 2 mol NH 3 = mol NH 3

 Stoichiometry is the study of quantities in chemical reactions.  Coefficients describe the number of moles of reactants and products involved in the reaction.  The molar ratio is the ratio of coefficients for two substances in a reaction.  The molar ratio is used to determine the amounts reactant needed, or product formed in a chemical reaction.