A sample of gasoline contains 81% iso-octane | vedclass

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(B) The octane number of a fuel is defined as the percentage of iso-octane ($2,2,4$-trimethylpentane) in a mixture of iso-octane and $n$-heptane that

Vedclass · Accepted Answer

$81$

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(B) The octane number of a fuel is defined as the percentage of iso-octane ($2,2,4$-trimethylpentane) in a mixture of iso-octane and $n$-heptane that has the same knocking characteristics as the fuel being tested.Since the sample contains $81\%$ iso-octane,its octane number is $81$.

$A$ sample of gasoline contains $81\%$ iso-octane and $19\%$ $n$-heptane. Its octane number will be

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