ans is $1\mathrm{.}28$ gal of ethanol

$(25$ pts$)$ I've developed a new racing engine. It runs on a mixture of one of the main

components of gasoline $($C$8$H$18,$ Specific Gravity $0\mathrm{.}703)$ and ethanol $($C$2$H$6$O$,$

$SG=0\mathrm{.}789),$ but it runs on a higher blend than I can get commercially. I can purchase a

blend that is $5\%$ ethanol on a volume basis. If my engine requires a fuel that is $25\%$

ethanol on a molar basis, and I purchase $20$ gallons of commercially available gasoline,

how much pure ethanol $($gallons$)$ would I have to add to create my fuel? HINT: You

should start by determining the composition of the final fuel on a volume basis, and this

can be done without answering the other parts of the question.