CaO → Ca(OH)2 → H2O → RbOH → Rb2SO4 → CaSO4 , решите балов

H2O + CaO → Ca(OH)2

Ca(OH)2  → H2O  + CaO

H2O + Rb2O → 2 RbOH

H2SO4  + 2 RbOH  → 2 H2O + Rb2SO4

h2so3 + 2nacl = 2hcl + na2so3

24.5/82 = 0.3 моль

60/58.5 = 0.9 моль

то  hcl = 0.6 моль

то v hcl = 0.6 * 22.4 = 13.44л

1*0.25=250

m(al2o3)=27*2+16*3=54+48102

102-54 al

250-x

x=250*54: 102=132.4кг аl

102-48

250-x

x=250*48: 102=118кг o

250-100%

132.4-x

x=52.8%al

250-100%

118-x

x=118*100: 250=47.2% o