1. Oblicz stosunek masowy pierwiastków w: - tlenku glinu - chlorku magnezu 2. Oblicz skład procentowy pierwiastków w: - tlenku siarki (VI) - siarczku glinu

Zadanie 1 [latex]Al_2O_3[/latex] [latex] 2mAl=54u [/latex] [latex]3mO=48u [/latex] [latex]Al:O [/latex] [latex]54:48 [/latex] [latex]9:8[/latex] [latex]MgCl_2[/latex] [latex]mMgCl_2=24u+2*35,5u=24u+71u=95u[/latex] [latex]Mg:Cl=24:71[/latex] Zadanie 2 [latex]SO_3[/latex] [latex] m_{SO_3} =m_S+3m_O=32u+3 cdot 16u=80u [/latex] [latex]\%S= frac {32u}{80u} cdot 100\%=40\% [/latex] [latex]\%O= frac {3 cdot 16u}{64u} cdot 100\%=60\% [/latex] [latex]Al_2S_3[/latex] [latex] m_{Al_2S_3} =2 cdot m_{Al}+3m_S =2 cdot 27u+3 cdot 32u=150u [/latex] [latex] \%Al= frac {2 cdot 27u}{150u} cdot 100\%=36\% [/latex] [latex] \%S= frac {3 cdot 32u}{150u} cdot 100\%=64\%[/latex]