Răspuns:
se aplica relatia
c=mdx100/ms, unde
md= 0,5g acid ascorbic
ms=md+m,apa= 0,5+200=> 200.5g
(stiu ca densitatea apei e 1g/ml, deci la 200ml apa corespund 200g)
c= 0,5x100/200,5=0,25%
0,5g
M,acid ascorbic=96g/mol
niu-=m/M=0,5g/96g/mol=0,0052mol
1mol,,,,,,,,,,6,023x10²³ molecule
0,0052mol........x=N=0,03X10²³molecule
Explicație:
