Question

2.
Two elements X (atomic mass = 50) and Y (atomic mass = 16) combine to give a
compound having 32% Y. The formula of the compound is
(A) X2Y3
(C) XY
(B) XY2
(D) X3Y4
​

Answer 1

Answer:

(a) x2y2...........................

Answer 2

Answer:

The answer is X2Y3

Explanation:

Given,

Atomic mass of X = 50

Atomic mass of Y = 16

Percentage mass of Y= 32%

Solution:

As we know, the total mass percentage = 100%

Therefore, Percentage mass of X =(100-32) =68%

Let us consider the mass of the compound to be 100 g.

So, mass of X= 68g

and mass of Y= 32 g

Now, no. of moles = (mass/atomic mass)

No. of moles of X= 68/50= 1.36

No.of moles of Y= 32/16= 2

So, simplest mole ratio ( moles/smallest no. of moles)

simplest mole ratio of X= 1.36/1.36=1

simplest mole ratio of Y = 2/1.36=1.5

So, for simplest whole number ratio , we multiply them by 2.

So, simplest whole number ratio of X=2

and simplest whole number ratio of Y =3

Therefore, their empirical formula of compound = X2Y3.

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