Question

Suppose the elements X & Y combine to form compounds , XY2 & X3Y2. If 0.1 mole of XY2 weight 10g and 0.05 moles of X3Y2 weighs 9g , the atomic weights of X & Y are
(a) 40, 30
(b) 60, 40
(c) 20 , 30
(d) 30 , 20 ​

Answer 1

Explanation:

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

Given 0.1 mole of XY 2 weighs 10g⇒x+2y= 0.110 =100⟶(1)0.05 mole of X 3 Y 2 weighs 9g⇒3x+2y= 0.059 =180⟶(2)(1)⇒x=100−2ySubstituting for x in Equation (2)⇒3(100−2y)+2y=180⇒300−6y+2y=180⇒y=30

Hence x=100−2(30)=40

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