1. and cooking with chemicals
Stoichiometry
and cooking with chemicals

2. Interpret a balanced equation in terms of moles, mass, and volumes of gases.
Solve stoichiometric problems involving moles, mass, and volume, given a balanced chemical reaction.
Include: heat of reaction
Additional KEY Terms
Stoichiometry
Molar ratio

4. “The calculation of quantities in chemical reactions.”
STOICHIOMETRY
“The calculation of quantities in chemical reactions.”
N2 (g) H2 (g)
2 NH3 (g) H N
1 molecule molecules molecules

5. Only the mass and atoms are conserved in every chemical reaction.
N2 (g) H2 (g)
2 NH3 (g)
1 mole moles moles
28g g g
22.4 L +
Only the mass and atoms are conserved in every chemical reaction.

6. 1 N2 2 NH3 3 H2 1 N2 1 N2 3 H2 N2 (g) + 3 H2 (g) 2 NH3 (g)
Molar Ratio
1 N2 : 3 H2 1 N2 : 2 NH3
3 H2
1 N2
1 N2
3 H2
1 N2
2 NH3

7. N2 (g) + 3 H2 (g) 2 NH3 (g) How many moles of H2 are used with
a) 2 mol N2
b) 0.5 mol N2
1 mol N2
3 mol H2
2 mol N2
= 6 mol H2
1 mol N2
3 mol H2
0.5 mol N2
= 1.5 mol H2

8. N2 (g) + 3 H2 (g) 2 NH3 (g) 2 mol NH3 0.350 mol H2 = 0.233 mol NH3
How many moles of ammonia gas can be made from moles of hydrogen gas?
N2 (g) H2 (g)
2 NH3 (g)
3 mol H2
2 mol NH3
0.350 mol H2
= mol NH3

9. 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.
Molar ratio used to determine the amounts reactant needed, or product formed in a chemical reaction.

10. CAN YOU / HAVE YOU?
Interpret a balanced equation in terms of moles, mass, and volumes of gases.
Solve stoichiometric problems involving moles, mass, and volume, given a balanced chemical reaction.
Include: heat of reaction
Additional KEY Terms
Stoichiometry Molar ratio