How many moles are there on 17.5 grams of sodium?

3 Answers

  • Okay, Carol.

    You have to know the formula : n = m / M

    where, n = number of moles

    m = given mass

    M = Molar mass of the substance.

    In this case, n = ?

    m = 17.5 g

    M = molar mass of Sodium = 22.9897

    So, number of moles, n = 17.5 / 22.9897 = 0.7612 or 0.76 moles.

    Note: There is another formula you MUST know N = n x NA

    where, N = number of particles (atoms, molecules, etc),

    n = number of moles

    NA = Avogadro’s Number: 6.023 * 10 ^ 23

    Premika.

  • One mole masses 23.0 grams

  • (23.00 g/mol)^-1 x 17.5g = 0.761 mol

Leave a Comment