What mass Al produced 100 g Al2O3

What mass Al produced 100 g Al2O3

 

 

What mass of aluminium is produced from 100 g of aluminium oxide?

 

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> Al2O3의 몰질량 = 101.96 g/mol

> Al의 몰질량 = 26.98 g/mol

 

 

 

Al2O3 : Al = 101.96 g : 2×26.98 g = 100 g : ? g

 

? = (2×26.98) (100) / (101.96) = 52.9 g Al

 

 

 

답: 52.9 g

 

 

 

 

또는

100 g / (101.96 g/mol) = 0.9808 mol Al2O3

( 참고 https://ywpop.tistory.com/7738 )

 

 

 

2Al2O3 → 4Al + 3O2

 

Al2O3 : Al = 2 : 4 = 1 : 2 계수비(= 몰수비) 이므로,

Al2O3 : Al = 1 : 2 = 0.9808 mol : ? mol

 

? = 2 × 0.9808 = 1.9616 mol Al

 

 

 

1.9616 mol × (26.98 g/mol) = 52.9 g Al