A laboratory has a volume of 36 m³ at 25 °C and normal pressure…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A laboratory has a volume of at and normal pressure. Use for the volume of one mole of vapour and for diethyl ether. The lower flammable limit is 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 : at and . The lower flammable limit of ether vapour is by volume. A titration gives moles of thiosulphate, and two thiosulphate ions react with each . An activating group directs to the ortho and para carbons.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Given. , limit .
Step 1. Vapour. .
Step 2. Moles. .
Step 3. Mass. .
Check. A bottle holds about of ether, so a bottle and a half is enough. This is why ether is handled in small amounts and in a fume cupboard.
Answer: , and .
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