Question

URGENT PLZ
Intr-un vas sunt 900 grame de apa sarata cu o concentratie de 10% . Daca se mai adauga 100 grame de sare , aflati noua concentratie a solutiei

Answer 1

C% = md * 100 / ms

md.final = md1 + md2

ms.final = ms1 + md2

c% initiala = md1 * 100 / ms1 => md1 = c% * ms / 100 = 90 g

=> md.final = md1 + md2 = 90 + 100 = 190 g

ms.final = ms1 + md2 = 900 + 100 = 1000 g

=> C% final = md.final * 100 / ms.finala =  190 * 100 / 1000 = 19%