What is the % labelling of oleum in which mole fraction of H2SO4 is 0.49?

To find the % labelling of oleum, we need to determine the concentration of the labeled component (which in this case is H2SO4) in the solution. The mole fraction of H2SO4 is given as 0.49, but we need to convert it to a percentage.

To calculate the mole fraction of H2SO4, we use the equation:

Mole fraction = (moles of H2SO4) / (total moles of all components)

The mole fraction of H2SO4 is given as 0.49, which means that 49% of the total moles of all components in the solution are H2SO4. Thus, the % labelling of oleum is 49%.