Oblicz ile procent masy stanowi woda w gipsie krystalicznym a ile w gipsie palonym
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2CaSO₄× H₂0
mCaSO₄----290u
mH₂0------18u
290u------100%
18u--------- x % H₂O
x%H₂O=(18×100%) / 290= 6,2%
GIPS PALONY:
CaSO₄×2H₂0
mCaSO₄= 172u
mH₂O = 18u
172u --- 100%
18u --- %H2O
%H2O = (18 * 100%) / 172 = 10,5%