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Some Basic Conc...

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  • Question 1
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    Calculate the percentage composition of nitrogen in urea (H2NCONH2H_2NCONH_2).

  • Question 2
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    Calculate the percentage composition of iron in a ferric oxide (Fe2O3Fe_2O_3).
    (Atomic mass of Fe=56Fe = 56)

  • Question 3
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    What is the percentage composition of the elements in ammonia (NH3NH_3)? 

    (N=14, H=1)(N = 14,\ H = 1)

  • Question 4
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    What is the mass of a mole of water containing 50% of heavy water (D2O)(D_2O) ?

  • Question 5
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    What are the percentage compositions of hydrogen and oxygen in water (H2O)(H_2O)? 

    (H=1, O=16)(H =1,\ O = 16) 

  • Question 6
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    The value of the Avogadro constant is:

  • Question 7
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    If 'M' is the molecular weight of a gas, what volume in ll at STP would be occupied by M/4 g of that gas?

  • Question 8
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    If 11g of oxalic acid are dissolved in 500 mL of solution (density= 1.1 g mL−1mL^{-1}), what is the mass % of oxalic acid in solution?

  • Question 9
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    The number of moles of NaCl in 3 litres of 3 M solution is:

  • Question 10
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    A solution is prepared by dissolving 5.64 g of glucose in 60 g of water. Calculate the mass percent of glucose. 

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