Doritos
You are given 10 grams of NaCl and asked to find moles of NaCl.
Which conversion factor(s) do you need?
Molar Mass
You are given 2.0 moles of CO₂ and asked to find the number of molecules.
Which conversion factor(s) do you need?
Avogadro’s number
You are given 3.0 moles of H₂ and asked to find moles of H₂O using a balanced equation.
Which conversion factor(s) do you need?
Mole Ratio
You are given 4.5 moles of O₂ gas at STP and asked to find the volume in liters.
Which conversion factor(s) do you need?
Molar Volume
You are given 20 grams of CH₄ and asked to find the number of molecules of CH₄.
Which conversion factor(s) do you need?
Molar mass and Avogadro’s number
A student has 3.0 moles of carbon dioxide (CO₂) from a reaction. How many grams of CO₂ do they have?
132 g CO₂
A container holds 6.0 moles of oxygen gas (O₂) at STP. What is the volume in liters of this gas?
134.4 L O₂
A sample contains 2.5 moles of water (H₂O). How many molecules of water are present?
1.51×1024 molecules H2O
N₂ + 3H₂ → 2NH₃
During a reaction, 4.0 moles of nitrogen gas (N₂) react completely. How many moles of ammonia (NH₃) are produced?
8.0 moles NH₃
A Chorine (Cl2) gas sample occupies 11.2 liters at STP. How many moles of gas are present?
0.50 moles Cl2
A student collects 20 grams of carbon dioxide (CO₂). How many molecules of CO₂ does this sample contain?
2.73×1023 molecules CO₂
2H₂ + O₂ → 2H₂O
In a reaction, 10 grams of hydrogen gas (H₂) react completely. How many moles of water (H₂O) are produced?
5.0 moles H₂O
A balloon contains 5.0 liters of oxygen gas (O₂) at STP. What is the mass of the oxygen gas in grams?
7.14 g O₂
N₂ + 3H₂ → 2NH₃
A reaction starts with 3.0 moles of nitrogen gas (N₂). How many grams of ammonia (NH₃) are produced?
102 g NH₃
A sample contains 25 grams of water (H₂O). If the water were converted to gas at STP, what volume in liters would it occupy?
31.1 L H₂O
CH₄ + 2O₂ → CO₂ + 2H₂O
A student burns 15 grams of methane (CH₄). What volume of carbon dioxide (CO₂) gas at STP is produced?
21.0 L CO₂
2H₂ + O₂ → 2H₂O
A reaction uses 22.4 liters of oxygen gas (O₂) at STP. How many grams of water (H₂O) are produced?
36.0 g H₂O
2H₂O → 2H₂ + O₂
A student decomposes 18 grams of water (H₂O). How many molecules of oxygen gas (O₂) are formed?
3.01×1023 molecules O₂
2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O
If 2.0 moles of ethane (C₂H₆) react completely, what volume of carbon dioxide (CO₂) at STP is produced?
89.6 L CO₂
CaCO₃ → CaO + CO₂
A sample contains 30 grams of calcium carbonate (CaCO₃). How many molecules of carbon dioxide (CO₂) are produced?
1.81×1023 molecules CO₂
N₂ + 3H₂ → 2NH₃
A student mixes 25 grams of nitrogen gas (N₂) with 10 grams of hydrogen gas (H₂).
Which reactant is the limiting reactant?
H₂ is limiting
2H₂ + O₂ → 2H₂O
A reaction is set up with 10 grams of hydrogen gas (H₂) and 40 grams of oxygen gas (O₂).
Which reactant will run out first (the limiting reactant)?
O₂ is limiting
(CH₄ + 2O₂ → CO₂ + 2H₂O)
A reaction uses 50 grams of methane (CH₄) and 80 grams of oxygen gas (O₂).
Identify the limiting reactant and the excess reactant.
Limiting: O₂
Excess: CH₄
2Al + 3Cl₂ → 2AlCl₃
A student reacts 15 grams of aluminum (Al) with 35 grams of chlorine gas (Cl₂).
Which substance is in excess?
Cl₂ is excess
Ca + 2H₂O → Ca(OH)₂ + H₂
A reaction uses 20 grams of calcium (Ca) and 20 grams of water (H₂O).
Determine the limiting reactant and how many grams of hydrogen gas (H₂) are produced.
Limiting: H₂O
Product: ~1.12 g H₂