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32+16*3 = 32+ 48 = 80
80----------100%
32-----------x%
32*100 / 80 = 40 %
80---------100%
48---------x%
48*100/80=60%
Odp. Jest 40% siarki i 60% tlenu
siarczek glinu -Al2S3
27*2+32*3=150
150--------100%
54------x%
54*100/150=36 % glinu
150-------100%
96--------x%
96*100/150=64% siarki