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xu-----------61,5u
x=48u(3 mole O2)
H2EO3
78u-48u-2u=28u
28u------->Si
H2SiO3
78u --- 100%
x --- 61,5%
x = 47,97 ~~ 48u
48u :16 = 3 mole tlenu
mH₂EO₃ = 2u + mE + 48u = 50u + mE
50u + mE = 78u
mE = 28u --- krzem [Si]
H₂SiO₃ -- otrzymany kwas