if 20 g CaCO3 is a added to 20 gram HCl select the true statement.
Correct answer: A. CaCO3 is the limiting reagent
- A. CaCO3 is the limiting reagent
- B. Both reactants are consumed completely
- C. HCl is the limiting reagent
- D. There is no reaction
Explanation
The equation for the reaction isCaCO3 + 2HCl → CO2 + H2O + CaCl2Mr of HCl= 1 + 35.5 = 36.5Mr of CaCO3= 40 + 12 + (3x16) = 1002x36.5g of HCl => 1 mole of CaCl220g of HCl => x mole of CaCl2x= 0.27mol100g of CaCO3 => 1 mole of CaCl220g of CaCO3 => x mole of CaCl2x= 0.2mol As lesser moles of CaCl2 (product) is produced by CaCO3 hence it is the limiting reactant.
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About Fundamental Concepts of Chemistry
Mole calculations connect mass, number of particles and Avogadro's number, while balanced equations provide the mole ratios used in stoichiometry. Questions cover limiting and excess reactants, theoretical yield and percentage yield, including identifying which reactant is consumed first and comparing the actual product with the maximum possible product.
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