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Define the terms (i) Gram atom and (ii) Gram molecule. How are they related to the mole and Avogadro number? |
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Answer» (i) Gram atom:- The atomic mass of element expressed in grams is called its gram atomic mass. It is said to be equal to one gram atom. A gram atom of any element contains 6.023 x 1023 atoms of the element. The gram atomic mass of an element is equal to the sum of the masses of its 6.023 x 1023 atoms. Example: 1 gram-atom of hydrogen atom (u = 1) weighs 1 gram and contains 6.023 x 1023 hydrogen atoms. (ii) Gram-Mole:- The molecular mass of a substance expressed in grams is called its gram molecular mass. A gram molecular mass of substance contains 6.023 x 1023 molecules. Example: A gram molecular mass of hydrogen molecules (molecular mass = 2) weighs 2 grams and contain 6.023 x 1023 hydrogen molecules. |
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