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7 October, 21:06

Calculate the percent by mass of potassium nitrate in a solution made from 45.0 g kno3 and 295 ml of water. The density of water is 0.997 g/ml.

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  1. 8 October, 00:27
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    Answer: the percent by mass of potassium nitrate is 13.3%

    Explanation:

    1) dа ta:

    Mass of solute, m₁ = 45.0 g Volume of solvent, V₂ = 295 ml density of water, d₂ = 0.997 g/ml

    2) Formulae:

    Percent by mass, % = (mass of solute / mass of solution) * 100

    Density, d = mass / volume

    3) Solution:

    d = mass / volume ⇒ m₂ = d₂ * V₂ = 0.997 g/ml * 295 ml = 294. g mass of solution = m₁ + m₂ = 45.0g + 294. g = 339. g % = (45.0 g / 339. g) * 100 = 13.3 % The answer has to be reported with 3 significant figures.
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