дано
m(ppa KOH) =700 g
W(KOH) = 8%
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n(K)-?
m(KOH) = 700 * 8% / 100% = 56 g
2K+2H2O-->2KOH+H2
M(KOH) = 56 g/mol
n(KOH) = m/M = 56 / 56 = 1 mol
2n(K) = 2n(KOH) = 1 mol
n(KOH) = 1 mol
ответ 1 моль
S+O2=SO2
SO2+H2O=H2SO3
H2SO3+2NaOH=Na2SO3+2H2O
3Na2So3+2H3Po4=2Na3Po4+3H2SO3