Question

Suppose the element x and y combine to form two compound xy2 and x3y2. When 0.1 mole of xy2 weighs 10g and 0.5 mol of x3y2 weighs 9 g the atomic wieght of x and y are?

Answer 1

Explanation:

Let atomic weight of x = Mx

atomic weight of y = My

we know,

mole = weight /atomic weight

a/c to question,

mole of xy2 = 0.1

so,

0.1 = 10g/( Mx +2My)

Mx + 2My = 100g -------(1)

for x3y2 ; mole of x3y2 = 0.05

0.05 = 9/( 3Mx + 2My )

3Mx + 2My = 9/0.05 = 9× 20 = 180 g ---(2)

solve eqns (1) and (2)

2Mx = 80

Mx = 40g/mol

and My = 30g/mole

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