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mHCl=1u+35,5u=36,5u
1u-x%
36,5u-100%
x=1u*100%/36,5u
x=2,74%H
100%-2,74%=97,26%Cl
kwas siarkowodorowy- H2S
mH2S=2*1u+32u=34u
2u-x%
34u-100%
x=2u*100%/34u
x=5,88%H
100%-5,88%=94,12%S