Question

Substantele dizolvate in punga de 1000 ml ser fiziologic de c=0,9% si in punga de 500 ml glucoza de c=5% (considerand ca ambele solutii au ro=1) sunt:
a)25 g sare si 25 g glucoza
b)aceeasi cantitate de sare si de glucoza
c)9 g sare si 25 g glucoza
d)0,9 g sare si 5 g glucoza

Answer 1

raspunsul corect este c) . uite si rezolvarea

1g/cm3=1000g/l

1000ml=1l

p=ms/V1=p*V=1000 g/l*1l=1000g

= ms2=0.5l*1000g/l=500g

c1=md*100/ms1

=md1=c1*ms/100

md1=0.9*1000/100

=md1=9g

md2=c2*ms2/100

md2=5*500/100

md=25g

deci

md1=9g

md2=25

sper ca te-am ajutat . coroana ??