Mr(<span>FeOHSO4) =56+16+1+32+4*16=169
W(Fe)56/169=0.33=33%
W(O)=16/169=0.1=10%
W(H)=1/169=0.01=1%
W(S)=32/169=0.19=19%
W(O)=64/169=0.37=37%</span>
ZnS + 2O2 = ZnSO4
<span>ZnSO4 + 2KOH = K2SO4 + Zn(OH)2
</span><span>Zn(OH)2 + 2HCl = ZnCl2 + 2H2O
</span>ZnCl2 + 2AgNO3 = Zn(NO3)2 + 2AgCl
<span>2Zn(NO3)2 + t = 2ZnO + 4NO2 + O2</span>
1) AlCl3 + 3NaOH = Al(OH)3 + 3NaCl
2) Al(OH)3 + 3HCl = AlCl3 + 3H2O
Al(OH)3 + 3H+ +3Cl- = Al3+ + 3Cl- + H2O
Al(OH)3 + 3H = Al3+ + H2O
3) Al(OH)3 + NaOH = Na[Al(OH)4]
6K + N2 ---> 2K3N
1 : 2
n(в-ва) = V/Vm
n(N2) = 13,44 л / 22,4 л / моль = 0.6 моль
n(K3N) = 0,6 * 2 = 1,2 моль
m(K3N) = 1,2 моль * 131 г / моль = 157,2 г
Ответ: 157,2 г