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Tovkachova22
@Tovkachova22
July 2022
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ДОРОМОЖІТЬ будь-ласка 75 балов
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Alexei78
1)
M(H2CO3)=62g/mol
M(Fe2O3)=256g/mol
M(Al(OH)2=61g/mol
2)
95+8=103 г - масса раствора
W=8/103*100%=7.77%
ответ 7.77%
3)
W(Na)=Ar(Na)*n/M(Na2O)*100%
M(Na)=23g/mol
M(o)=16g/mol
M(Na2O)=62g/mol
W(Na)=23*2/62*100%=74.19%
W(O)=16/62*100%=25.81%
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Answers & Comments
M(H2CO3)=62g/mol
M(Fe2O3)=256g/mol
M(Al(OH)2=61g/mol
2)
95+8=103 г - масса раствора
W=8/103*100%=7.77%
ответ 7.77%
3)
W(Na)=Ar(Na)*n/M(Na2O)*100%
M(Na)=23g/mol
M(o)=16g/mol
M(Na2O)=62g/mol
W(Na)=23*2/62*100%=74.19%
W(O)=16/62*100%=25.81%