Question

element X and Y combine to form two compound XY and X2Y find the weight of Xand Y ,IF THE WEIGHT OF .1 MOLE of XY is 10g and .05 mole of X2Y is 9g??

Answer 1

Answer:

Answer

Let x and y be the atomic weights of X and Y

Given 0.1 mole of XY

2

weighs 10g

⇒x+2y=

0.1

10

=100⟶(1)

0.05 mole of X

3

Y

2

weighs 9g

⇒3x+2y=

0.05

9

=180⟶(2)

(1)⇒x=100−2y

Substituting for x in Equation (2)

⇒3(100−2y)+2y=180

⇒300−6y+2y=180

⇒y=30

Hence x=100−2(30)=40