Odpowiedź :
2Al+3S--->Al2S3
m 2Al=2*27u=54 u
m 3S=3*32u=96 u
mAl2S3=2*27u+3*32u=150u
Cu(OH)2--->CuO+H2O
mCu(OH)2=63,5u+2*16u+2*1u=97,5u
mCuO=63,5u+16u=79,5 u
mH2O=2*1u+16u=18 u
2Al+3S--->Al2S3
m 2Al=2*27u=54 u
m 3S=3*32u=96 u
mAl2S3=2*27u+3*32u=150u
Cu(OH)2--->CuO+H2O
mCu(OH)2=63,5u+2*16u+2*1u=97,5u
mCuO=63,5u+16u=79,5 u
mH2O=2*1u+16u=18 u