Question

what is 2kg if dry, 1kg if wet and 3 kg if burnt

Answer 1

The element Sulphur has an atomic weight 32 and is the only element that can show similar changes.

When Sulphur is mixed with water, it does not dissolve but floats which reduce its atomic weight to 16 due to Buoyant force.

When the element burns it transforms into Sulphur dioxide which has the atomic weight of 64.