Como calcular o numero de moléculas em 90g de água

Como calcular o numero de moléculas em 90g de água



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    1 mol = 6,02 x 10 molculas

    Logo:

    Massa em 1 mol de HO:

    Massa do H = 1 g/mol
    Massa do O = 16 g/mol

    Ento:

    (2 . 1) + 16
    2 + 16 = 18 g/mol

    1 mol de HO tem 18 g.

    Nmero de mols em 90 g de HO:

    1 mol —— 18 g
    x mol —— 90 g

    1 . 90 = x . 18
    90 = 18x
    x = 90/18

    x = 5 mol

    Em 90 g de HO so 5 mol.

    Quantidade de molculas em 5 mol de HO:

    1 mol —— 6,02 x 10
    5 mol —— y

    1 . y = 5 . 6,02 x 10

    y = 30,1 x 10 molculas

    Em 90 g de HO h 30,1 x 10 molculas.

  • Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
    18 g de H2O ——————-> 6×10^23 molculas
    90 g de H2O——————-> x molculas

    90.6×10^23 = 18x
    540×10^23=18x
    x=540×10^23/18
    x= 30×10^23 molculas


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