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23 January, 12:15

How many hydrogen atoms are present in a 2.65 gram sample of hydrazine (N2H4) ?

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  1. 23 January, 13:08
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    4.95*10^22 atoms of hydrogen.

    Explanation:

    Now, we must remember that the number of elementary entities in one mole of a substance (atoms, molecules, ions, etc) is given by the Avogadro's number. Avogadro's number is numerically equal to 6.02*10^23.

    We must first find the number of moles of hydrazine corresponding to 2.65 g

    We find that from;

    Number of moles = mass of hydrazine given / molar mass of hydrazine

    Molar mass of hydrazine = 32.0452 g/mol

    Number of moles of hydrazine = 2.65/32.0452 g/mol = 0.0823 moles

    If 1 mole of hydrazine contains 6.02*10^23 hydrogen atoms

    0.0823 moles of hydrazine will contain 0.0823 moles * 6.02*10^23 = 4.95*10^22 atoms of hydrogen.
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