## Chemistry: Molecular Approach (4th Edition)

$\underline{ 7.27\,\ US\ dollars\text{ per gallon }}$
Price of $1\text{ liter}$ of gasoline is $1.42\text{ euro}$. Convert $\text{euro}$ to $\text{US}\$ as follows: \begin{align} & 1\text{ euro}=\ \text{1}\text{.35 US dollar} \\ & 1.42\text{ euro}=\left( 1.42 \right)\left( \text{1}\text{.35 US dollar} \right) \\ & =\,\ 1.92\,\text{US dollar} \end{align} Convert $\text{liter}$ into $\text{gallon}$ as follows: $\frac{1}{3.785}\text{ gallon}$ costs $1.92\,\text{US dollar}$. So, \begin{align} & \text{1 gallon}=\left( 1.92\,\text{US dollar} \right)\left( 3.785 \right) \\ & =7.27\text{ US dollar per gallon} \end{align} The price of $1\text{ gallon}$ gasoline in U.S. dollars is $7.27\,\underline{\text{US dollars per gallon }}$..