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A) AlCl3
M AlCl3 = 27 + 35,5 x 3 = 27 + 106,5 = 133,5 u
% Al = 27/133,5 x 100% = 20%
% Cl = 106,5/133,5 x 100% = 80 %
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B) Na2SO4
M Na2SO4 = 23 x 2 + 32 + 16 x 4 = 46 + 32 + 64 = 142 u
% Na = 46/142 x 100% = 32 %
% S = 32/142 x 100% = 23 %
% O = 64/142 x 100% = 45 %
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C) Pb(NO3)2
M Pb(NO3)2 = 207 + 28 + 96 = 331 u
% Pb = 207/331 x 100% = 63 %
% N =28/331 x 100% = 8 %
% O = 96/331 x 100% = 29 %
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