Answer:
Following are the answer to this question:
Explanation:
The most stable carbocation is: 
- The means of
is a hydrocarbon with
, which is needed to find the double bonds.
- The formula for calculating the unsaturation hydrocarbons are:
Degree of the unsaturation

Where,
C=9, N=0, X=0, H=12


which means 3 double bonds and 1 ring.
- The most stable carbocation is given in the attachment file. please find the attachment.
Let y be concentration of the final solution:
y = (0.1x + 0.3(500))/(500 + x)
y = (0.1x + 150) / (500 + x)
The numerator contains the total amount of acid and the denominator contains the volume of the solution.
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You can use the since of feel by feeling how smooth and rough an object is.