Ответ:
дано
m(ppa H2SO4) = 343 g
W(H2SO4) = 40%
+KOH
m пр.(K2SO4) = 208.8 g
-----------------------
η(K2SO4)-?
m(H2SO4) = 343 * 40% / 100% = 137.2 g
H2SO4+2KOH-->K2SO4+2H2O
M(H2SO4) = 98 g/mol
n(H2SO4) = m/M = 137.2 / 98 = 1.4 mol
n(H2SO4) = n(K2SO4)
M(K2SO4) = 174 g/mol
m теор (K2SO4) = n*M = 1.4 * 174 = 243.6 g
η(K2SO4)= m пр(K2SO4) /mтеор(K2SO4) * 100% = 208.8 / 243.6 * 100% = 85.7%
ответ 85.7 %
Объяснение: