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  4. Calculate the octane number of gasoline fuel, which contains text25 % textn-heptane and 75 % is textiso-octane .

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Q. Calculate the octane number of gasoline fuel, which contains $\text{25\%} \, \text{n-heptane}$ and $75\%$ is $\text{iso-octane}$ .

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Solution:

Octane number is defined as the percentage by volume of iso-octane present in the mixture of $iso-octan e$ and $n-heptan e$ which has the same antiknocking properties as the fuel under examination.

Given fuel (25% n-heptane +75% iso-octane) Hence, octane number = 75 (because iso octane is 75%)