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19 March, 11:37

Determine the molecular formula of a compound with an empirical formula of NH2 and a formula mass of 32.06 g/mol.

NH

NH2

N2H4

N3H6

+3
Answers (1)
  1. 19 March, 13:23
    0
    The molecular formula is N2H4 (option 3 is correct)

    Explanation:

    Step 1: Data given

    Empirical formula = NH2

    Molar mass of the compound = 32.06 g/mol

    Atomic mass of N = 14.0 g/mol

    Atomic mass of H = 1.01 g/mol

    Step 2: Calculate the molar mass of this empirical formula

    The empirical formula says for every N atom we have 2H atoms

    The molar mass of this empirical formula is:

    14.01 + 2*1.01 = 16.03 g/mol

    Step 3: Calculate the molecular formula

    We have to multiply the empirical formula by n

    n = (molar mass of molecular formula / molar mass of empirical formula)

    n = 32.06 / 16.03 = 2

    Molecular formula = 2 * (NH2)

    Molecular formula = N2H4

    The molecular formula is N2H4 (option 3 is correct)
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