Empirical, Molecular Formula and Limiting Reactants

1. What is limiting reactants? Why is it essential in stoichiometric calculations?
2. 10.6gm of pure Na2CO3 if treated with 7.9gm of HCl to produce NaCl, H2O and CO2, (5 marks)
          a) Find the limiting reactants and calculate mole of unreacted reagent left over.
          b) What volume of CO2 gas is produced at NTP?
          c) Calculate the mass of NaCl formed.
3. A chemical reaction was carried out by mixing 25gm of pure Calcium Carbonate and 0.75 mule of pure hydrochloric acid to give CaCl2, H2O and CO2. (5 marks)
        a) Which one is the limiting reactant and why?
        b) Calculate the mass of CaCl2 produced.
        c) How many number of water molecules are formed?
        d) What mass of NaOH is required to absorb the whole CO2produced in the reaction? 

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