Question

in 400g de sare concentratie 10% se adauga 40 g sare noua solutie are concentratia procentuala de a.13,33% b,15,50%c.18,18%d.22%

Answer 1

Răspuns:

C1 = md1x100/ms1

md1 = C1xms1/100 = 400x100/100 = 40g sare

md2 = 40 + 40 = 80g sare

ms2 = 400 + 40 = 440g sol de sare

C2 = md2x100/ms2 = 80x100/440 = 18,18%

c.18,18%

Explicație: