Firstly you need to write a balanced symbol equation for the reaction:
C6H12 + H2 ----> C6H14
Then calculate the number of moles of hexane using mass/Mr:
258g/86.0 = 3 moles
From the balanced equation we can see there is a 1:1 ratio between hexane and cyclohexane in this reaction. This means 3 moles of cyclohexane can be made from 258g of hexane.
Now you need to calculate the mass of cyclohexane, which can be done by multiplying the Mr by the number of moles:
3 x 84.0 = 232g
232g of cyclohexane can be produced from 258g of hexane.