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Calculati concentratiile moalare ale solutiilor urmatoare:

a)1,9*10^4g NaCN in 100 ml
b)27 g glucoza C6H12O6 in 500 ml

Va rog este urgent ofer 40 pct mrs


Răspuns :

C=n/V
n=m/M
A) M NaCN=23+12+14=49g/mol
 n=1,9*10^4/49=3,87moli
C=3,87/0.1=38,77 M

B) M C6H12O6=12*6+12+6*16=72+12+96=180g/mol
n=27/180=0.15 moli
C= 0,15/0,5=0,3 M