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Question

# Calculate the grams or milliliters of solute needed to prepare the following solutions:a. 150 mL of a $40.0 \%$ (m/v) $\mathrm{LiNO}_3$ solutionb. 450 mL of a 2.0 %(m / v) KOH solutionc. 225 mL of a \$15 %(v / v) isopropyl alcohol solution

Solution

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a) $V(LiNO_3)=150ml$ (solution) $m/V(LiNO_3)=40\%$ By knowing the pattern:

$m/V=\dfrac{mass \ of \ solute}{volume \ of \ solution}\cdot100\%$

we will calculate what is unknown to us:

$mass \ of \ solute=\dfrac{40}{100}\cdot150=\boxed{60g}$

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