Mole Ratios
What is the mole ratio for N2 to NH3:
N2 + 3H2 → 2NH3
1:2
What determines the amount of products formed in a chemical reaction?
limiting reactant
What is the mole ratio of KClO3 to KCl?
2KClO3 → 2KCl + 3O2
2:2 or 1:1
What the study of the relationships or ratios between two or more substances undergoing a chemical reaction?
Stoichiometry
How many moles of hydrogen can be produced from 4 moles of zinc?
Zn + 2HCl → ZnCl2 + H2
4 moles
10 grams of oxygen can be produced in a chemical reaction but only 9.0 grams are recovered in the lab. What is the percent yield?
90%
How many moles of hydrogen can be produced from 4 moles of hydrochloric acid (HCl)?
Zn + 2HCl → ZnCl2 + H2
2 moles
How many grams of aluminum (Al) are needed to form 2.5 mol of hydrogen (H2)? (2 steps)
2Al + 6HCl → 2AlCl3 + 3H2
45 grams
How many moles of oxygen are needed to produce 8 moles of hydrogen?
C3H8 + 5O2 → 3CO2 + 4H2
10 moles
How many grams of water (H2O) are formed from 75 grams of oxygen (O2)? (3 steps)
C6H12O6 + 6O2 → 6CO2 + 6H2O
42 grams