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31 May, 21:35

One mole of beryllium (be) contains the same number of atoms as 22.99 g of sodium. There are about 2.007*1023 atoms in 9.0 g al. One mole of calcium (ca) weighs about as much as two moles of neon (ne). 11.495 g of sodium contains 6.022*1023 atoms.

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  1. 31 May, 23:44
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    1) the number of atoms (or molecules or ions) in one mole of any substance is same = 6.023 X 10^23

    Thus as mass of one mole of sodium = 22.99 grams, this is equal to molar mass of sodium

    moles of sodium = mass / molar mass = 22.99/22.99 = 1

    Thus number of atoms in Be will be same the number of atoms of 22.99g of sodium

    2) The mass of aluminium is given = 9g

    atomic mass of Al = 27

    Moles of Al = mass / molar mass = 9 / 27 = 1/3

    The atoms of Al in one mole = 6.023 X 10^23

    Hence atoms of Al in 1/3 moles of Al = 6.023 X 10^23 / 3 = 2.007 X 10^23

    So given statement is true

    3) The mass of one mole of Ca = 40grams

    The mass of one mole of Neon = 20grams

    So yes one mole of Ca will weigh equal to two moles of Ne

    4) The atomic mass of sodium = 23 g / mole

    Thus 23 grams of sodium contains 6.022*1023 atoms and not 11.495 g of sodium
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