Benzene has a specific gravity of 0.88. if it was spilled in a river what would it do?

As we know,

Density of Benzene = 876 Kg/m³

And,

Density of Water = 997 Kg/m³

So,

Specific Gravity is calculated as,

Specific Gravity = Density of Benzene / Density of Water

Specific Gravity = 876 Kg/m³ / 997 Kg/m³

Specific Gravity = 0.878

Every object having specific gravity less than 1 will float on water and if value is greater than 1 then it will sink.

Benzene being non-polar in nature does not mix with water and due to less density it will float on the surface of water.