1) h2o..h2so4...h2(газ)
2)h2so4...hi...h2o
3)koh...h2o
4)h2so4..mno4..
5)koh..h2o
Дано
m(ppaKOH)=100g
W(KOH)=40%
HCL
------------------
m(KCL)-?
находим массу вещества KOH
m(KOH)=100*40%/100%=40 g
40 g Xg
KOH+HCL-->KCL+H2O M(KOH)=56 g/mol , M(KCL)=74.5 g/mol
56 74.5
40/56 = X/74.5
X=53.2 g
ответ 53.2 г
ZnCl2 → Zn(OH)2 → ZnCl<span>2
</span>Na2<span> [Zn(OH)</span>4<span>]
</span>
SO3 + H20 = H2SO4
S^6+ + 3O^2- + 2H^+ + 0^2- = 2H^+ + SO4^2-
S^6+ + 4O^2- = SO4^2-