Question

5.601g of barium salt was heated oxygen gas was only evolved and resudue was found to be barium chloride weighing 3.834g whats is the formula for the original salt and its name 

Answer 1

Moles of Barium chloride $=\frac{3.834}{208.23}=0.018moles$

Then original salt is BaSO4 barium sulphate