Question

-16.66 The reaction is the following Over the years, the thermite reaction has been used for welding railroad rails, in incendiary bombs, and to ignite solid-fuel rocket 3 V,0,(s)+10 Al(s) 6 V)+5 A,O, (s) What masses of vanadium(V) oxide and aluminum must be used to produce 11.3 g of vanadium? What is the maximum mass of aluminum oxide that could be produced Need Help?

Answer 1

From stoichiometry,

3 moles of V2O5 produce 6 moles of vanadium

Or we can write

(3 x 181.88 ) g of V2O5 produce = (6 x 50.94 ) g of V i.e vanadium

So 11.3 g of vanadium can be produced by =( 3 x 181.88 x 11.3 ) / (6 x 50.94) = 20.17 g of V2O5

similarly , 10 moles of Al produce = 6 moles of V

so , 10 x 26.98 g of Al produce = (6 x 50.94) g of V

so 11.3 g of V produce by = (10 x 26.98 x 11.3 ) / (6 x 50.94) i.e = 9.974 g of aluminum

maximum mass of Al2O3 that can be produced is (5 x 101.96) i.e 509.8grams