Ile gramów glinu znajduje się w 200 g siarczku glinu ?
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Al- 27u
S-32u
w siarczku glinu:
Al-27*2=54u
S-32*3u=96u
54+96=150
Al-54/150*100%=36%
na 200 g
36% z 200g=72g
Odp.72g.