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4×10^22 atoms of an element weigh 12g . Gram atomic weight of element |
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Answer» 180.9479
Note that 4 x 10²² atoms = 0.066 mol (use Avogadro’s number). Divide this into 12 g to get the number of grams per mole. Use a periodic table to FIND the element with the CORRESPONDING ATOMIC WEIGHT. the amount of one gram atomic weight (M gram) of an element contains an Avogadro number of atoms, NA = 6.023 x 10^23 atoms per gram atom. Therefore 4 x 10^22 atoms represent (4 x 10^22) / (6.023 x 10^23) = 0.066412 gram atom of any element. Dividing 12 gram by 0.066412 leads to the DESIRED gram atomic weight M = 180.69 gram. The nearest value corresponds to Tantal, the official value of the gram atomic weight of Ta being 180.9479 |
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