The reaction of powdered aluminium and iron (III) oxide,

produces so much heat, that the iron which forms is molten. If 2 mol of Al is mixed with 0.8 mol of Fe2O3, how many grams of iron (in two significant figures) can be formed from this reaction?

(At. masses: Al = 27, Fe = 56, O = 16)

'x' gm of a compound A3B2C5 contains 'y' gm of A atoms

 

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how to represent the possible fischer projections for 2-bromohexane