Question #28586

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Answer 1 · 2018-01-12T04:47:01

$a . 75 g$ $a. 75g$
$b . 175 m l$ $b. 175ml$

Given the %mass of the solution and the mass of the solution, mass of solute can be computed as;

$%mass solution = \frac{mass solute}{mass solution}$ $"%mass solution"="mass solute"/"mass solution"$

$mass solute = %mass solution \times mass solution$ $"mass solute"="%mass solution" xx "mass solution"$

$mass solute = 0.30 \times 250 g = 75 g$ $"mass solute"=0.30xx250g=75g$

Then, find the mass of the solvent, knowing that;

$mass solution = mass solute + mass solvent$ $"mass solution"="mass solute"+"mass solvent"$

$mass solvent = mass solution - mass solute$ $"mass solvent"="mass solution"-"mass solute"$

$mass solvent = 250 g - 75 g = 175 g$ $"mass solvent"=250g-75g=175g$

Now, find the volume of the solvent; knowing that the density of water @ $4^{o} C$ $4^oC$ = 1g/ml; so that,

$ρ = \frac{m}{V}$ $rho=m/V$
$V = \frac{m}{ρ}$ $V=m/rho$
$V=(175cancel(g))/((1cancel(g))/(ml))$
$V=175ml$