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M NaOH=40g/mol
1mol -40g NaOH
0,3mola - x
x=12 g NaOH
II. 0,2 kmola = 200moli gdyz 1kmol = 1000moli
M K2SO4 =174g/mol
1mol - 174g K2SO4
200 moli - y
y=34800g K2So4
III 250 mmola = 0,25 mola
M SO3 = 80 g/mol
1 mol - 80 g SO3
0,25 - z
z= 20g SO3
iv. 0,035kmola = 35moli
M BaSO4= 233g/mol
1 mol - 233g
35 moli - z
z =8155g Baso4
kolejność rosnąca I, III, IV, II