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mHCl=36,5u
Al₂O₃ + 6HCl ---> 2AlCl₃ + 3H₂O
102g tlenku ----- 6*36,5g kwasu
1,02g tlenku ----- xg kwasu
x = 2,19g kwasu
ms=2,19g
Cp=10%
mr=ms*100%/mr
mr=2,19*100/10
mr = 21,9g roztworu kwasu