Question

What is mass of solution which contains 15 gram Nacl with a concentration of 12.42% w/w? ​

Answer 1

Explanation:

Mass of Nacl=15g

Mass % =12.42%

Mass%= mass of solute /mass of solution ×100

$\frac{12.42}{100} = \frac{15}{15 + x}$

$12.42(15 + x) = 15 \times {10}^{2}$

$186.3 + 12.42x = 1500$

$12.42x = 1500 - 186.3$

$x = \frac{1,313.7}{12.42}$

$x = 105.8g$

Mass of solution =15+105.8=120.8