Edexcel A-Level Chemistry AS B 0 0 Units in Calculations Questions

Practise Edexcel IAL Chemistry 7.1.1 by converting volume units, applying density relationships and reporting calculated masses or densities with appropriate units and rounding.

Exam points

Use density units in mass-volume calculations, converting dm³ to cm³ before multiplying or dividing.
Report calculated masses or densities with appropriate g, cm³ or g cm⁻³ units and sensible rounding.

[Maximum number: 1]

Many cars use fuels containing ethanol as well as hydrocarbons. The E numbers of these fuels show the percentage by volume of ethanol in the fuel. For example, an E5 fuel contains 5\% ethanol and 95\% hydrocarbons by volume.

A brand of E10 fuel contains 92.2% hydrocarbons and 7.80% ethanol by mass.

The energy density is the amount of energy released per kg of a fuel burned. The energy densities of the two components of this brand of fuel are shown.

\begin{array}{ll} \text { energy density of hydrocarbons } & =46.5 \mathrm{MJ} \mathrm{~kg}^{-1} \\ \text { energy density of ethanol } & =29.7 \mathrm{MJ} \mathrm{~kg}^{-1} \end{array}

The density of the E 10 fuel is $0.729 \mathrm{~g} \mathrm{~cm}^{-3}$ .

Calculate the mass of $1500 \mathrm{~cm}^{3}$ of the fuel.

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Edexcel A-Level Chemistry AS B 0 0 Units in Calculations Questions question 1