Edexcel IAL Chemistry 1.4 Relative mass, molar mass and ppm

Build the formula mass from relative atomic masses, convert ppm to the stated mass or volume fraction and retain the required units and significant figures.

Exam points

Calculate relative atomic, molecular or formula mass from isotope or formula data.
Convert ppm into mass, gas volume or particle number for the stated sample.
Use percentage by mass to test fertiliser, polymer or pollutant composition claims.

[Maximum number: 1]

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 $\alpha$ -bisabolene in 5.51 g .

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1.4—The terms: i ‘relative atomic mass’ based on the 12C scale ii ‘relative molecular mass’ and ‘relative formula mass’ question 1