Friday, August 3, 2012

Assignments of chapter #01



Prepared by:

Lecturer. S.Fayyaz Hussain




              (Science Campus)

Add: 24/2 Sheet # 10 Model Colony Near Model Colony Police Station

 Ph # 021-35449369, 0312-5449369


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?


5 comments:

  1. Replies
    1. The answer will post on http://fayyazhussainchemistry.blogspot.com . which is for AKUEB student this is for student Karachi intermediate board.

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