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James
James asked in Science & MathematicsChemistry · 3 years ago

Molarity question?

Calculate the molarity of a solution prepared by dissolving 33.2 g K2CrO4 in 590 g H2O. Assume that the density of the solution is 1.00 g/mL. The molar mass of K2CrO4 is 194.19 g/mol and the molar mass of H2O is 18.02 g/mol.

A) 0.274 M

B) 0.293 M

C) 0.290 M

D) 0.260 M

E) 0.279 M

2 Answers

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  • Dr W
    Lv 7
    3 years ago

    use dimensional analysis

    .. .. ..33.2g K2CrO4.. .... .... 1 mol K2CrO4.. ... 1.00g solution.. . 1000mL

    ---- --- ---- ---- ---- ---- ---- x ---- ---- ---- ---- --- x ---- ----- ---- ---- x ----- ----- = 0.274M

    ..(33.2g + 590g) solution... 194.19g K2CrO4... 1 mL solution.. ... .. 1L

  • Roger the Mole
    Lv 7
    3 years ago

    (33.2 g + 590 g) / (1.00 g/mL) = 623.2 mL solution

    (33.2 g K2CrO4) / (194.19 g K2CrO4/mol) / (0.6232 L) = 0.274 mol/L

    So answer A.

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