Question

If the average atomic mass of an element is 35.5u then the mole ratio

Answer 1

Let x be fraction of Cl37 in Cl35.5.

So, 37x + 35(1-x)= 35.5

37x + 35 -35x = 35.5

2x= 0.5

x = 0.25

Hence, 25% Cl37.

So, ratio is 3:1.