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Dla gipsu krystalicznego - CaSO4*2H2O.
Obliczamy masę cząsteczkową:
m = 40[u] + 32[u] + 64[u}+ 36[u] = 172[u]
%Ca = (40*100) / 172 = 23,3[%].
%S = (32*100) /172 = 18,6[%].
%O = (96 *100) / 172 = 55,8[%].
% H = (4*100) / 172 = 2,3[%].
Z poszanowaniem :zbigniew63.