Mole Conversions
How many molecules are in 1 mole?
6.022 x 1023
What is the first step in solving any stoichiometry problem?
Balancing the equation
What volume does 1 mole of gas occupy at STP?
22.4L
What is the limiting reactant?
The reactant that runs out first
What is percent yield?
Efficiency of a reaction
How many moles are in 18 g of H₂O?
1 mole
In 2H2 + O2 → 2H2O
How many moles of H2O form from 2 moles of H2?
2 moles of H2O
How many liters are in 2 moles of gas?
44.8L
2H₂ + O₂ → 2H₂O
Given 4 mol H₂ and 1 mol O₂, which is limiting?
O₂
What is the formula for percent yield?
(actual ÷ theoretical) × 100
How many moles are in 44g of Co2?
1 mole
N₂ + 3H₂ → 2NH₃
How many moles NH₃ from 1 mole N₂?
2 moles of NH3
How many moles are in 44.8 L of gas?
2 moles
N₂ + 3H₂ → 2NH₃
Given 1 mol N₂ and 2 mol H₂, which is limiting?
H2
If theoretical = 10 g, actual = 8 g, what is % yield?
80%
How many grams are in 2 moles of O2?
2H₂ + O₂ → 2H₂O
How many moles O₂ are needed for 4 moles H₂?
2 moles of O2
How many liters are in 0.5 moles of gas?
11.2L
Why is the limiting reactant important?
It determines how much product forms
If theoretical = 20 g, actual = 15 g, what is % yield?
75%
How many molecules are in 2 moles?
1.2044 x 1024 molecules
N₂ + 3H₂ → 2NH₃
How many moles H₂ are needed to produce 2 moles NH₃?
3 moles of H2
How many moles are in 11.2 L of gas?
0.5 moles
2H₂ + O₂ → 2H₂O
If O₂ runs out first, what is it called?
Limiting reactant
If % yield = 50% and theoretical = 10 g, what is the actual yield?
5g