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Stoichiometric Calculations Using Chemical Equations

Chemistry ⇒ Stoichiometry and Chemical Calculations

Stoichiometric Calculations Using Chemical Equations starts at 10 and continues till grade 12. QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Stoichiometric Calculations Using Chemical Equations. How you perform is determined by your score and the time you take. When you play a quiz, your answers are evaluated in concept instead of actual words and definitions used.
See sample questions for grade 10
A reaction has the equation: 2AgNO3 + Cu → Cu(NO3)2 + 2Ag. If 0.5 moles of Cu are used, how many moles of Ag are produced?
A reaction has the equation: 2C + O2 → 2CO. If 24 g of C reacts with 32 g of O2, which is the limiting reactant? (C = 12 g/mol, O2 = 32 g/mol)
A student burns 16 g of CH4 in excess O2 (CH4 + 2O2 → CO2 + 2H2O). How many grams of CO2 are produced? (CH4 = 16 g/mol, CO2 = 44 g/mol)
A student reacts 10 g of Fe with excess S according to Fe + S → FeS. How many grams of FeS are produced? (Fe = 56 g/mol, S = 32 g/mol, FeS = 88 g/mol)
A student reacts 5.0 g of Ca with excess HCl according to the equation: Ca + 2HCl → CaCl2 + H2. Calculate the mass of H2 produced. (Ca = 40 g/mol, H2 = 2 g/mol)
Describe the steps involved in calculating the mass of product formed from a given mass of reactant using a balanced chemical equation.
How many grams of NaCl are produced when 5.85 g of Na reacts with excess Cl2 (2Na + Cl2 → 2NaCl)? (Na = 23 g/mol, NaCl = 58.5 g/mol)
How many molecules of CO2 are produced when 0.5 moles of C2H6 are combusted according to: 2C2H6 + 7O2 → 4CO2 + 6H2O? (Avogadro's number = 6.02 × 1023)
If 0.25 moles of Mg react with excess HCl (Mg + 2HCl → MgCl2 + H2), how many liters of H2 gas at STP are produced? (1 mole gas at STP = 22.4 L)
If 10 g of H2O are decomposed by electrolysis (2H2O → 2H2 + O2), how many grams of O2 are formed? (H2O = 18 g/mol, O2 = 32 g/mol)
If 2.0 moles of Na react with excess Cl2 according to 2Na + Cl2 → 2NaCl, how many moles of NaCl are formed?
If 3.0 moles of H2 react with 2.0 moles of O2 (2H2 + O2 → 2H2O), what is the limiting reactant?
If 4 moles of NH3 are produced from the reaction N2 + 3H2 → 2NH3, how many moles of H2 are required?
If the actual yield of a reaction is 8.0 g and the theoretical yield is 10.0 g, what is the percent yield?
In the reaction 2KClO3 → 2KCl + 3O2, how many grams of O2 are produced from 12.25 g of KClO3? (Molar mass KClO3 = 122.5 g/mol, O2 = 32 g/mol)
In the reaction 2SO2 + O2 → 2SO3, how many liters of O2 at STP are needed to react with 4.48 L of SO2?
What is the mole ratio of H2 to O2 in the balanced equation: 2H2 + O2 → 2H2O?
A chemist wants to produce 100 g of water by reacting hydrogen and oxygen gases. The balanced equation is 2H2 + O2 → 2H2O. Calculate the minimum mass of O2 required. (H2O = 18 g/mol, O2 = 32 g/mol)
A reaction has the equation: 2K + Br2 → 2KBr. If 19.6 g of K (K = 39.1 g/mol) are reacted with 80.0 g of Br2 (Br2 = 160 g/mol), what is the maximum mass of KBr (KBr = 119 g/mol) that can be formed?
A sample of calcium carbonate (CaCO3) is heated according to the equation: CaCO3 → CaO + CO2. If 50.0 g of CaCO3 (CaCO3 = 100 g/mol) is decomposed, calculate the volume of CO2 gas produced at STP (1 mole gas = 22.4 L).