Question

Va rog am nevoie imi pune patru profa .Dau coroana.​:)​

Answer 1

Răspuns:

1.

a)

ms = 10 g

C% = 0,9%  

md=?

md = ms×C/100 = 10x0,9/100= 0,09 g NaCl

b)

md = 22,5 g

C= 0,9%

ms=?

ms= md×100/C= 22,5x100/0,9 = 2500 g ser fiziologic

2.

a)  

mapa=180g

ms=200g

C=?

md=200-180=20g sare

C=md×100/ms=20×100/200=10%

A=10%

b)

md2=20+10=30g

ms2=200+10=210g

C=md×100/ms=30×100/210=14,28%

B=14,28%

Explicație: