Define octane number. A sample of gasoline produces the same knocking as mixture containing 35% n-heptane and 65% iso-octane. What is the octane number of the sample ?

Explanation

**Step-by-Step Solution:**

1. **Definition of Octane Number:**
The octane number is a measure of the performance of gasoline or fuel in terms of its ability to resist knocking during combustion. It is determined by comparing the fuel's performance to a mixture of n-heptane (which has an octane number of 0) and iso-octane (which has an octane number of 100).

2. **Understanding the Given Mixture:**
The problem states that a sample of gasoline produces the same knocking as a mixture containing 35% n-heptane and 65% iso-octane.

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