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KCl : 1 atom potasu, 1 atom chloru m=1x39u+1x35,5u=74,5u
Ag2O; 2atomy srebra, 1 atom tlenu m=2x108u+16u=232u
Fe2S3; 2atomy żelaza, 3 atomy siarki m=2x56u+3x32u=176u
K2SO3; 2atomy potasu, 1 atom siarki, 3 atomy tlenu m=2x39u+32u+3x16u=158u
Al2(SO4)3; 2 atomy glinu,3 atomy siarki, 12 atomow tlenu m=2x27u+3x32u+12x16u= 342u
(NH4)3PO4; 3 atomy azotu, 12 atomow wodoru, 1 atom fosforu, 4 atomy tlenu m=3x14u+12x1u+1x31u+4x16u=149u
mCuO= 64u+16u=80u
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