LR / XS
Magnesium reacts with oxygen.
_____Mg + _____O₂ → _____MgO
If 8.0 g of Mg reacts with excess O₂, how many grams of MgO are produced?
13.3 g MgO
Theoretical yield = 25.0 g
Actual yield = 20.0 g
Percent yield?
80%
H₂ + Cl₂ → 2HCl
Start with 2 mol H₂ and 2 mol Cl₂.
How many moles of HCl are formed?
4 mol HCl
How many moles are in 44.0 g CO₂?
1.00 mole CO₂
2H₂ + O₂ → 2H₂O
If 10.0 g H₂ reacts with excess O₂, how many grams of H₂O are produced?
89.3 g H₂O
Hydrogen reacts with oxygen.
2H₂ + O₂ → 2H₂O
If 5.0 moles H₂ react with 1.5 moles O₂:
a) What is the limiting reactant?
b) How many moles of H₂O are formed?
O₂ is limiting and 3.0 moles H₂O?
Calcium carbonate decomposes:
CaCO₃ → CaO + CO₂
If 50.0 g CaCO₃ produces 24.0 g CaO (actual), what is the percent yield?
85.7%
2H₂ + O₂ → 2H₂O
Start with 4 mol H₂ and 1 mol O₂.
How many moles H₂ remain?
2 mol H₂ remain
How many molecules are in 3.0 moles H₂O?
1.81 × 10²⁴ molecules
N₂ + 3H₂ → 2NH₃
If 6.02 × 10²³ molecules of H₂ react with excess N₂, how many molecules of NH₃ are produced?
4.01 × 10²³ molecules NH₃
Zn + 2HCl → ZnCl₂ + H₂
If 10.0 g Zn reacts with 8.0 g HCl:
a) What is the limiting reactant?
b) How many grams of H₂ are produced?
HCl is limiting and 0.22 g H₂
If theoretical yield is 100 g and percent yield is 60%, what was the actual yield?
60 g
N₂ + 3H₂ → 2NH₃
Start with 2 mol N₂ and 3 mol H₂.
a) Limiting reactant?
b) Moles NH₃ formed?
H₂ is limiting and 2 mol NH₃
At STP, what volume does 2.5 moles of gas occupy?
56.0 L
CaCO₃(s) → CaO(s) + CO₂(g)
If 25.0 g CaCO₃ decomposes completely, how many liters of CO₂ are produced at STP?
5.60 L CO₂
2Al + 3Cl₂ → 2AlCl₃
If 15.0 g Al reacts with 40.0 g Cl₂:
a) What is the limiting reactant?
b) How many grams of AlCl₃ are produced?
Al is limiting and 66.7 g AlCl₃
2Na + Cl₂ → 2NaCl
If 10.0 g Na produces 12.0 g NaCl (actual), what is the percent yield?
89.3%
2CO + O₂ → 2CO₂
Start with 5 mol CO and 1 mol O₂.
How many moles CO₂ form?
2 mol CO₂
What is the molarity of a solution made by dissolving 5.0 moles of NaCl in 2.0 L?
2.5 M
AgNO₃(aq) + NaCl(aq) → AgCl(s) + NaNO₃(aq)
If 150.0 mL of 0.200 M AgNO₃ reacts with excess NaCl, how many grams of AgCl form?
4.30 g AgCl
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
If 44.0 g propane reacts with 96.0 g oxygen:
a) What is the limiting reactant?
b) How many grams of CO₂ are formed?
O₂ is limiting and 79.2 g CO₂
4Al + 3O₂ → 2Al₂O₃
If 20.0 g Al produces 30.0 g Al₂O₃ (actual), what is the percent yield?
70.0%?
4Fe + 3O₂ → 2Fe₂O₃
Start with 8 mol Fe and 6 mol O₂.
How many moles Fe₂O₃ form?
4 mol Fe₂O₃
How many grams are in 2.0 × 10²³ molecules of O₂?
10.6 g O₂
2Al + 3Cl₂ → 2AlCl₃
If 3.00 × 10²³ molecules of Cl₂ react with excess Al, how many grams of AlCl₃ are produced?
44.5 g AlCl₃