A sample of diesel has the same characteristics as a 60 ml mixture of cetane and `alpha` -methyl napthalene mixed in `2:1` ratio (v/v). What is the centane number of the diesel sample?

Explanation

To determine the cetane number of the diesel sample, we can follow these steps:

### Step 1: Understand the Mixture Ratio
The problem states that the mixture consists of cetane and alpha-methyl naphthalene in a 2:1 ratio by volume. This means for every 2 parts of cetane, there is 1 part of alpha-methyl naphthalene.

### Step 2: Calculate the Volume of Each Component
The total volume of the mixture is given as 60 ml. Since the ratio is 2:1, we can divide the total volume into 3 parts (2 parts cetane + 1 part alpha-methyl naphthalene).

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