MediumChemistryHigh School (11–12)Organic Compounds with Functional Groups › Alcohols, Phenols and EthersNumerical

A laboratory has a volume of 36 m³ at 25 °C and normal pressure…

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A laboratory has a volume of $36\ \text{m}^3$ at $25\ ^\circ\text{C}$ and normal pressure. Use $24.46\ \text{L/mol}$ for the volume of one mole of vapour and $74.123\ \text{g/mol}$ for diethyl ether. The lower flammable limit is $1.9\ \%$ by volume. Find the volume of vapour that reaches this limit, the amount of ether, and the mass of liquid that must evaporate.

Need a reminder? The key ideaShow

One mole of an ideal gas occupies $\dfrac{RT}{P}$ : $24.46\ \text{L}$ at $25\ ^\circ\text{C}$ and $101.325\ \text{kPa}$ . The lower flammable limit of ether vapour is $1.9\ \%$ by volume. A titration gives moles of thiosulphate, and two thiosulphate ions react with each $\text{I}_2$ . An activating group directs to the ortho and para carbons.

The worked solution

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