Vocabulary
What term describes the calculation of reactants and products in a chemical reaction based on balanced equations?
Stoichiometry
How many moles of H₂O are produced when 2 moles of H₂ react with O₂?
2 moles of H₂O
If 2.0 moles of H₂ react with excess O₂, how many grams of H₂O are formed?
36 grams of H₂O
How many grams of CO₂ are produced from 22 grams of C₂H₆ combustion?
29.3 grams of CO₂
What is the numerical value of Avogadro’s number?
6.022 × 10²³ particles/mole
What is the term for the reactant that determines the maximum amount of product that can be formed?
Limiting reactant
How many moles of CO₂ are produced when 5 moles of C₂H₆ combust completely?
10 moles of CO₂
If 0.5 moles of Al react with excess Cl₂, how many moles of AlCl₃ are formed?
0.5 moles of AlCl₃
How many grams of H₂O are produced when 10 grams of H₂ react with excess O₂?
90 grams of H₂O
If a reaction has a theoretical yield of 50 grams and an actual yield of 40 grams, what is the percent yield?
80%
What is the term for the amount of product actually obtained from a reaction compared to the theoretical maximum?
Percent yield
How many moles of NH₃ are needed to completely react with 6 moles of O₂?
8 moles of NH₃
If 4.0 grams of CH₄ react completely with oxygen, how many grams of CO₂ are formed?
11 grams of CO₂
How many grams of Fe₂O₃ are produced from 28 grams of Fe?
40 grams of Fe₂O₃
What is the first step in any stoichiometry calculation?
Balance the chemical equation
What law states that matter cannot be created or destroyed in a chemical reaction?
Law of Conservation of Mass
How many moles of Fe₂O₃ are produced when 9 moles of Fe react?
4.5 moles of Fe₂O₃
If 6 moles of NH₃ react with 9 moles of O₂, which is the limiting reactant?
NH₃ (ammonia)
How many grams of NH₃ are needed to produce 51 grams of N₂?
62 grams of NH₃
If 2.5 moles of a gas occupy 56 liters, what is the molar volume of the gas at STP?
22.4 L/mol
What is the term for the reactant that is left over after the reaction is complete?
Excess reactant
How many moles of H₂O are produced when 2.5 moles of C₃H₈ combust?
10 moles of H₂O
How many grams of H₂O are produced when 10 moles of O₂ react with hydrogen?
180 grams of H₂O
How many grams of AlCl₃ are produced when 27 grams of Al react with excess Cl₂?
133.5 grams of AlCl₃
If a reaction releases 150 kJ of energy, what type of reaction is it?
Exothermic reaction