The thermit rection used to weld iron rails in building a rail track, involves the following reaction Fe_(2)O_(3)+2AlrarrAl_(2)O_(3)+2Fe Calculate the mass of iron metal that can be prepared from 150 g of aluminium and 250 g of iron (iii) oxide.

The thermit rection used to weld iron rails in building a rail track,

1.	The thermit rection used to weld iron rails in building a rail track, involves the following reaction Fe_(2)O_(3)+2AlrarrAl_(2)O_(3)+2Fe Calculate the mass of iron metal that can be prepared from 150 g of aluminium and 250 g of iron (iii) oxide.
Answer» Solution :The thremit reaction is : `underset(underset(=160g)(2xx56+3xx16))(Fe_(2)O_(3))+underset(underset(=54g)(2xx27))(2Al)rarr2Al_(2)O_(3)+underset(underset(=112g)(2xx56))(2Fe)` From the available data, it is evident that 150 g of AL metal need `Fe_(2)O_(3)=((160g))/((54g))XX(150g)=444.4g` But `Fe_(2)O_(3)` actually available = 250 g This means `Fe_(2)O_(3)` is the LIMITING reactant. The mass of Fe metal which can be PREPARED from 250 g of `Fe_(2)O_(3)=((112g))/((160g))xx(250g)=175g`.