Question

A compound AB completely decomposes into A and B on heating. 50 g of AB, on strong heating, gave 40 g of A. How much quantity of AB should be decomposed by heating to obtain 2.5 g of B? How much quantity of A will be produced in the process?

Answer 1

Since according to law of conversion of mass, $50g$ of AB produces $40g$ of A and $10g$ of B, so when we heat $12.5g$ of Ab, we will get its $1/5^{th}$ part as B and $4/5^{th}$ part as A.