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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 11
A reaction has a percent yield of 60%. If the theoretical yield is 50.0 g, what is the actual yield?
A reaction has a theoretical yield of 25.0 g and an actual yield of 20.0 g. What is the percent yield?
A reaction produces 15.0 g of product, but the theoretical yield is 20.0 g. What is the percent yield?
A student mixes 8.0 g of H_2 with 32.0 g of O_2. According to the equation 2H_2 + O_2 \rightarrow 2H_2O, which reactant is in excess? (Molar mass: H_2 = 2.0 g/mol, O_2 = 32.0 g/mol)
A student reacts 10.0 g of Ca with 20.0 g of Cl_2 to form CaCl_2 according to the equation: Ca + Cl_2 \rightarrow CaCl_2. Which is the limiting reactant? (Molar masses: Ca = 40.1 g/mol, Cl_2 = 70.9 g/mol)
Describe the steps involved in solving a stoichiometric problem involving mass-to-mass conversion.
Explain the difference between theoretical yield and actual yield.
Explain why a balanced chemical equation is necessary for stoichiometric calculations.
How many grams of NaCl are produced when 2.0 moles of Na react with excess Cl_2? (2Na + Cl_2 \rightarrow 2NaCl; Molar mass NaCl = 58.5 g/mol)
How many liters of CO_2 at STP are produced from 10.0 g of CaCO_3? (CaCO_3 \rightarrow CaO + CO_2; Molar mass: CaCO_3 = 100.0 g/mol; 1 mol gas at STP = 22.4 L)
How many moles of CO_2 are produced when 5 moles of C_2H_6 combust completely? (C_2H_6 + 3.5O_2 \rightarrow 2CO_2 + 3H_2O)
If 2.0 moles of Fe react with 3.0 moles of O_2 to form Fe_2O_3 (4Fe + 3O_2 \rightarrow 2Fe_2O_3), what is the limiting reactant?
If 4 moles of NH_3 are produced from the reaction N_2 + 3H_2 \rightarrow 2NH_3, how many moles of H_2 are required?
In the reaction 2KClO_3 \rightarrow 2KCl + 3O_2, how many grams of O_2 are produced from 12.25 g of KClO_3? (Molar mass: KClO_3 = 122.5 g/mol, O_2 = 32.0 g/mol)
In the reaction 2Na + 2H_2O \rightarrow 2NaOH + H_2, how many grams of NaOH are produced from 4.6 g of Na? (Molar mass: Na = 23.0 g/mol, NaOH = 40.0 g/mol)
In the reaction 2SO_2 + O_2 \rightarrow 2SO_3, how many moles of SO_3 are formed from 5 moles of SO_2?
What is the mole ratio of H_2O to O_2 in the balanced equation: 2H_2 + O_2 \rightarrow 2H_2O?