What is the mass of 9.44*10^24 molecules of NO2: The molar mass is 46.01g/mol?

2 Answers

  • To work out the mass of 9.44 x 10^24 molecules of NO2 and being given its molar mass of 46.01g/mol you have to use this formula which is


    n=number of moles

    N=molecules of substance

    NA=avogadro’s number which is 6.02 x 10^23

    n=(9.44 x 10^24)/(6.02 x 10^23)=15.68

    then to work out its mass you use this formula

    m=n x M


    n=number of moles

    M=molar mass

    m=15.68 x 46.01= 721.44g

    so the mass of 9.44 x 10^24 molecules of NO2 is 721.44g if you want to convert it into kilograms divide it by 1000 or 10^3 but the standard unit for mass is grams.

    Hope this answers your question=)

  • A molar mass of 46.01g means that every mole of NO2 molecules (6.02 x 10^23 molecules) weighs 46.01g

    So, divide 9.44 x 10^24 by 6.02 x10^23 to find how many moles of NO2 you have, then multiply this by the molar mass (46.01g)

    This should come out to 721.49g, or 0.721kg

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