Write the conditions to maximise the yield of `H_(2)SO_(4)` by Contact proces.

Explanation

The key step in the production of `H_(2)SO_(4)` is the oxidation of `SO_(2)` to `SO_(3)`.
`SO_(2)(g)leftrightarrow2SO_(3)(g)`: `Delta`,`H^(0)=-196.6kJmol^(-1)`
The reaction is exothermic, reversible and the forward reaction proceeds with decrease in volume. Therefore, in accordance with Le chatelier.s principle, to maximize the yield of `SO_(3)` and hence of `H_(2)SO_(4)` a low temperature (720 K to have optimum rate), a high pressure (2 bar) and `V_(2)O_(5)` is used as a catalyst (to increase the rate at 720 K).