Răspuns:
A,Mg=24g/mol M,H2SO4=98g/mol M,H2O=18g/mol
24g............98g
Mg + H2SO4--->MgSO4 +H2
48g...........x= 196g H2SO4
c= mdx100/ms----> ms=mdx100/c= 196x100/9,8g= 2000g solutie,
dar, ms= md+m,apa=> m,apa=2000-196=> 1804g
niu,apa=m/M=1804g/18 g/mol==100mol
1mol molecule............6,022x10²³molec.
100mol..........................x= 6,022x10²⁵molec. apa
Explicație: