What mass of Na2SO4is needed to make 2.5 L of 2.0 Msolution? (Na = 23 g; S = 32 g; O = 16 g) a.356 g b.284 g c.710 g

Question

What mass of Na2SO4is needed to make 2.5 L of 2.0 Msolution? (Na = 23 g; S = 32 g; O = 16 g)
a.356 g
b.284 g
c.710 g
d.178 g

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Gia Bảo 7 months 2021-07-14T06:32:46+00:00 1 Answers 3 views 0

Answers ( )

    0
    2021-07-14T06:33:57+00:00

    Answer:

    mass (g) needed = 710.2 grams Na₂SO₄(s)

    Explanation:

    Needed is 2.5 Liters of 2.0M Na₂SO₄; formula wt Na₂SO₄ = 142.04g/mol.

    mass (grams) of Na₂SO₄(s) = Molarity needed x Volume needed in Liters x Formula Wt of solute

    mass (grams) of Na₂SO₄(s) = (2.5L)(2.0M)(142.04g/mol) = 710.2 grams Na₂SO₄(s)

    Mixing: Transfer 710.4 grams Na₂SO₄ into mixing vessel and add water-solvent up to but not to exceed 2.5 Liters total volume. Mix until dissolved.

    Gives 2.5 Liters of 2.0M Na₂SO₄(aq) solution.

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