1.1- Assignment

Assignment #01

Class: XI (AKUEB)                                                               Topics: Mole

1.      Define the term “mole”

2.      What is the unit for the calculation of mole?

3.      What  does  Avogadro’s number represent?

4.      How many molecules of water in 10 g of ice?

5.      Calculate the number of hydrogen atom and oxygen atom separately in 10g of ice.

6.      Calculate the number of molecules in 10 g of H₂SO₄   

7.      Calculate the number of atoms in 40 amu of Ca and 40 g of Ca? is there same or not?

8.      How many atoms of hydrogen are there in 25g of NH₄Cl?

9.      What is the weight one atom of hydrogen?

10.  Calculate the number of atoms in each of the following :

         a  .   52   mole of He

         b  .   52amu of He

         c.       52g of He  

Assignment # 02

          

              Class: XI (AKUEB)                                                      Topics: Theoretical & Practical yield

        

        1- Calculate the theoretical yield of Calcium Oxide if 24.8 g of Calcium carbonate 
              decomposes.Calculate the percent yield if we got 13.1 g in the laboratory .

           CaCO₃ →CaO + CO₂

        2- What is the percent yield  if we experimentally produce 3.65g of copper when 1.87g
               of Aluminum react with 9.65g of copper  (II)sulphate .

           Al +CuSO₄ →  Cu + Al₂(SO₄)₃

        3 - Find the theoretical yield of silicon carbide if 50.0 g of silicon dioxide react with 79.1 g
                of Carbon .

        SiO₂ + C      →   SiC +CO 

        4. What is the percent yield  if 155 g of calcium carbonate is treated with 250g of hydrochloric 
             acid 142g of calcium chloride is obtained .

             CaCO₃  + HCl →CaCl₂ + CO₂ +H₂ O  

Assignment #03

     

        Class: XI (AKUEB)                                                               Topics: Limiting reactant

1.  Determine the mass of aluminum acetate that can be made if You do this reaction with 125 g of acetic acid and 275 g of aluminum hydroxide

3CH₃COOH  +Al(OH) ₃ → Al(CH₃COO) ₃ +3H₂O

What is the limiting reactant in the above problem ? How much of Excess reagent will be left over after the reaction is complete?

       2. Consider the following reaction:

            3CaCO₃ +2FePO₄→ Ca₃(PO₄) ₂  +Fe₂ (CO₃) ₃          

When 100 g of calcium carbonate anf 45 g of iron(III)Phosphate .     

What is the limiting reactant in the above problem ? How much of Excess reagent will be left over after the reaction is complete. What is the maximum amount of each products that can be formed?