Question

ce concentratie croncentruala are o solutie obtinuta prin dezolvarea a 30 g otet solutia finala avand 150 g

Answer 1

$c = 100 \times \frac{30}{150} \\ c = 100 \times \frac{1}{5} \\ c = \frac{100}{5} \\ c = 20\%$