Question

va rog imi trebuie repede ​

Answer 1

Răspuns:

Explicație:

1.

ms=144g

mapa =120

c

c=md .100 :ms

ms=md+mapa

md=ms - mapa

md=144g - 120g=24g NaCl

c= 24 . 100 :  144=16,6%

2.

mapa=80g

c=15%

md

c=md.100 : ms= md.100 : (md + mapa)

15 = md .100 : ( md + 80 )

15. ( md + 80 ) =100md

15md + 1200 =100md

100md - 15md= 1200

85 md=1200

md=14, 12g zahar