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29 July, 16:53

The empirical formula of a compound is NO2. Its molecular mass is 9.2g/mol. What is its molecular formula?

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  1. 29 July, 18:11
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    Molecular formula = N2O4

    Explanation:

    The empirical formula of a compound is NO2. Its molecular mass is 92g/mol. What is its molecular formula?

    Step 1: Data given

    The empirical formula = NO2

    The molecular formula = NO2

    Molar mass N = 14 g/mol

    Molar mass O = 16 g/mol

    Step 2: Calculate molecular mass of the empirical formula

    Molar mass NO2 = molar mass N + Molar mass of 2*O

    Molar mass NO2 = 14 + 2*16

    Molar mass = 46 g/mol

    Step 3: Calculate the molecular formula

    We have to multiply the empirical formula by n

    n = molecular mass / molecular mass of the empirical formula

    n = 92 g/mol / 46 g/mol

    n = 2

    We have to multiply the empirical formula by 2

    Molecular formula = 2 * (NO2)

    Molecular formula = N2O4
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