Question

Give the composition of oleum

Answer 1

H2S2O7

it is the composition of oleum

Answer 2

$H_2SO_4$ the composition of oleum

Explanation:

• Oleum, or fuming sulfuric acid, is a solution of various compositions of sulfur trioxide in sulfuric acid, or sometimes more specifically to disulfuric acid (also known as pyrosulfuric acid).  
• Because of the tendency to liberate Sulfur Trioxide on contact with air, Oleum is also known as “fuming Sulfuric Acid”.
• Formula of oleum is  Oleum is a useful form for transporting sulfuric acid compounds, typically in rail tank cars, between oil refineries (which produce various sulfur compounds as a byproduct of refining) and industrial consumers.
• Certain compositions of oleum are solid at room temperature, and thus are safer to ship than as a liquid.

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