Question

29. Suppose elements X and Y combine to form two compounds
XY2, and X, Y, when 0.1 mole of former weigh 10 g while
0.05 mole of the latter weigh 9 g. What are the atomic
weights of X and Y.​

Answer 1

Answer:

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Explanation:

ANSWER

X+2Y→XY

2

.....(i)

0.1 mol of XY

2

=10g

∴ 1 mol of XY

2

=100g

3X+2Y→X

3

Y

2

....(ii)

0.05 mol of X

3

Y

2

=9g

∴ 1 mol of X

3

Y

2

=

0.05

9

=180g

So, X+2Y=100 (Mol.wtofXY

2

=100)

3X+2Y=180 (Mol.wtofX

2

Y

3

=180)

Solving for X and Y, we get

X=40g; Y=30g