Question

Ce cantitate de solutie de concentratie 30% se obtine prin dizolvarea a 180 g de zahar in apa. AFLATI SI CANTITATEA DE APA FOLOSITA

Answer 1

$c = \frac{md \times 100}{ms} \\ \\ ms = \frac{md \times 100}{c} \\ \\ ms = 600 \: g \\ \\ ms = md + m_{apa} \\ \\ m _{apa} = ms - md \\ \\ m_{apa} = 420 \: g$