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mCa(OH)₂ = 40u + 2*16u + 2 * 1u = 40u + 32u + 2u = 74u
74u ---------- 100%
40u ----------- x
x = 40u * 100% / 74u
x = 54,1% zawartość wapnia w wodorotlenku
stosunek masowy
mCa : mO : mH
40 : 3u : 2
20 : 16 : 1