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Define 'molecular mass' of a substance...

Define 'molecular mass' of a substance.

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(a) Define gram molecular mass of a substance. How much is the gram molecular mass of oxygen ? (b) If sulphur exists as S_(8) molecules, calculate the number of moles in 100 g of sulphur. (S = 32 u)

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Knowledge Check

  • A solution of substance containing 1.05 g per 100 mL was found to be isotonic with 3% glucose solution . The molecular mass of the substance is :

    A
    `31.5`
    B
    `6.3`
    C
    630
    D
    63

  • 3% solution of glucose is isotonic with 1% solution of a non-volatile non-electrolyte substance. The molecular mass of the substance would be

    A
    180
    B
    360
    C
    420
    D
    60

  • The molecular mass of a substance is the relative mass of its molecule as compared with the mass of a carbon-12 atom taken as 12 units. The molecular mass of a substance indicates the number of times one molecule of a substance is heavier than (1)/(12) th of C-12 atom. It is equal to the sum of atomic masses of all the atoms present in a molecule. Depending on the number of atoms of same or different elements present in the molecule, it can be monoatomic, diatomic, triatomic, tetraatomic or a poly-atomic molecule.

    A
    triatomic molecules
    B
    triatomic and tetra-atomic molecules
    C
    diatomic and triatomic molecules
    D
    tetra-atomic molecules.

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    Rate of diffusion is directly proportional to the square root of molecular mass of substance.

    Define the term ' osmotic pressure' . Descibe how the molecular mass of a substance can be determined on the basis of pressrure measurement.

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    By dissolving 13.6 g of a substance in 20 g of water, the freezing point decreased by 3.7^(@)C . Calculate the molecular mass of the substance. (Molal depression constant for water = 1.863K kg mol^(-1))

    The molecular mass of a substance is the relative mass of its molecule as compared with the mass of a carbon-12 atom taken as 12 units. The molecular mass of a substance indicates the number of times one molecule of a substance is heavier than (1)/(12) th of C-12 atom. It is equal to the sum of atomic masses of all the atoms present in a molecule. Depending on the number of atoms of same or different elements present in the molecule, it can be monoatomic, diatomic, triatomic, tetraatomic or a poly-atomic molecule. Which is an example of a poly-atomic molecule?

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