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7 December, 09:23

You have 3.50 l of solution that contains 90.0 g of sodium chloride, nacl. what is the molar mass of nacl? what is the molarity of that solution?

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  1. 7 December, 09:31
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    M (NaCl) = Ar (Na) + Ar (Cl) · g/mol.

    M (NaCl) = 22,99 + 35,45 · g/mol.

    M (NaCl) = 58,44 g/mol.

    V (NaCl) = 3,5 L.

    m (NaCl) = 90 g.

    n (NaCl) = m (NaCl) : M (NaCl).

    n (NaCl) = 90 g : 58,44 g/mol.

    n (NaCl) = 1,54 mol.

    c (NaCl) = n (NaCl) : V (NaCl).

    c (NaCl) = 1,54 mol : 3,5 L.

    c (NaCl) = 0,44 mol/l = 0,44 M.
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