1) Fe2 O3
2*56 : 16*3
112 : 48
7: 3
W(Fe)= (100\%: 10)*7=70\%;
2) Fe3 O4
3*56 : 16*4
21 : 8
W(Fe)=(100\% :29)*21=72\%
<span>1) 8Cu2S + 15O2 = 6Cu2O + 4CuSO4 + 4SO2</span>
N = Nа * n
n = m/Mr
M(H2SO4) = 98
n=98/98 = 1 моль
N = 6*10^23 * 1 = 6*10^23 моль^-1
C6H14 ----> C6H6 + 4H2
Крекинг:
C6H14 ----->C2H6+C4H8
или
C6H14------>C3H6+C3H8
Mg[2+] + 2OH[-] = Mg(OH)2
Mg[2+] + 2Cl[-] + 2K[+] + 2OH[-] = Mg(OH)2 + 2K[+] + 2Cl[-]
MgCl2 + 2KOH = Mg(OH)2 + 2KCL