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Atoms And Molecules Test - 2

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Atoms And Molecules Test - 2
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  • Question 1
    1 / -0

    Mass of sodium in 62 g of Na2O is 46 g and in 186 g of Na2O is 138 g. This data supports the law that was given by

    Solution

    The data indicates that the percentage of Na in Na2O is fixed, i.e. 74.19%, and supports the law of constant proportions given by Joseph Proust.

     

  • Question 2
    1 / -0

    Which of the following will have the same empirical and molecular formulae?

    Solution

    Since the number of carbon, the number of hydrogen and the number of oxygen atoms in C3H8O are co-prime numbers, the empirical formula will be the same as the molecular formula.
     

    Molecular Formula Empirical Formula
    C3H8O C3H8O
    CH3COOH or C2H4O2 CH2O
    C6H12O6 CH2O
    H2O2 HO

     

     

  • Question 3
    1 / -0

    What is the molecular formula of the compound whose molecular mass is 26 u and empirical formula is CH?

    Solution

    Empirical formula mass = 12 + 1 = 13 u

    Molecular mass = 26 u
    n = 26/13 = 2

    Therefore, the molecular formula of the compound is C2H2.

     

  • Question 4
    1 / -0

    How many atoms of hydrogen are present in (NH4)2SO4 and NH4H2PO4, respectively?

    Solution

    Each formula unit of ammonium sulphate (NH4)2SO4 has 8 H atoms.
    Each formula unit of ammonium hydrophosphate NH4H2PO4 has 6 H atoms.

     

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