Assignments of chapter #01

Prepared by:

Lecturer. S.Fayyaz Hussain

              (Science Campus)

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Assignment #01

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.     52gram of He       

Assignment#02

1         

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                                                 Topics: Limiting reactant

1. 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?