Edexcel A-Level Chemistry AS 1.8 Chemical Equations to Calculate Volumes of Gases and Vice Versa Questions

Convert moles and gas volumes at r.t.p., apply stoichiometric ratios, and use pV = nRT with consistent pressure, volume and temperature units for gas calculations.

Exam points

use molar gas volume at r.t.p. with equations to calculate reacting gas volumes
apply pV = nRT after converting pressure, volume and temperature into SI units
link density, mass and moles of a volatile liquid to the volume of gas produced

[Maximum number: 3]

This question is about alkenes.

Bisabolenes are a group of compounds found in plants and fungi. Bisabolene molecules contain several carbon-carbon double bonds.
5.51 g of $\alpha$ -bisabolene reacted with $1873 \mathrm{~cm}^{3}$ of hydrogen gas, $\mathrm{H}_{2}$ . The reaction occured at a temperature of $150^{\circ} \mathrm{C}$ and a pressure of 152000 Pa .
$\left[M_{\mathrm{r}}\right.$ value: $\quad \alpha$ -bisabolene $\left.=204.0\right]$

Calculate the amount, in mol, of hydrogen gas that reacted with $\alpha$ -bisabolene. Use the ideal gas equation, p V=n R T.

\left[R=8.31 \mathrm{~J} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}\right]

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Edexcel A-Level Chemistry AS 1.8 Chemical Equations to Calculate Volumes of Gases and Vice Versa Questions question 1