(a)
Interpretation:
Atomic masses of element X and Y must be found out when mass of 0.25 mol of XY and that of 0.25 mol of X2Y3 is 17.96 g and 39.92 g respectively.
Concept introduction:

Answer to Problem 204A
Atomic masses of X and Y are 55.84 and 16 respectively.
Explanation of Solution
0.25 mol XY has mass
1 mol XY has mass
0.25 mol X2Y3 has mass
1 mol X2Y3 has mass
So,
b)
Interpretation:
Formulas of the two compounds must be found out for which 0.25 moles have mass of 17.96 g and 39.92 g respectively.
Concept introduction:
Elements can be identified from the atomic mass and valency.
b)

Answer to Problem 204A
Formulas of the two compounds are FeO and Fe2O3.
Explanation of Solution
Atomic mass of X is 55.84 and that of Y is 16. This suggests that X is Fe and Y is O. Oxygen has valency 2 whereas Fe has two valencies which are 2 (in ferrous compound) and 3 (in ferric compound). So the expected formulas of the two compounds are FeO and Fe2O3.
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