Question

40 g sare sare gema cu 10% impuritati se dizolva in160g de apa.Care este concentratia procentuala a solutiei obtinute va rog frumos

Answer 1

p=m_{pura}:m_{impura}·100
m_{pura}=p·m_{impura}:100=90·40100=36g NaCl (m_{d})
c=m_{d}·100:m_{s}
m_{s}=m_{d}+m_{apa}=36+160=196
c=36·100:196=18,36%