A student treats 0.450 g of ethylamine, C₂H₅NH₂ (45 g/mol), with sodium nitrite and dilute…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A student treats of ethylamine, (), with sodium nitrite and dilute hydrochloric acid. Nitrogen gas bubbles off and ethanol forms. Find the amount of ethylamine. Find the volume of nitrogen at 273 K and 1 atm. Find the mass of ethanol () formed at a yield of 100 %.
Need a reminder? The key ideaShow
The amine lone pair attacks carbon atoms that are short of electrons. Primary and secondary amines are acylated. Only primary amines give the carbylamine reaction. Nitrous acid gives nitrogen gas with a primary aliphatic amine. At 273 K and 1 atm, one mole of gas has a volume of . Hinsberg's reagent gives an alkali-soluble sulphonamide with a primary amine, an insoluble one with a secondary amine and no product with a tertiary amine.
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.
Step 1. Amount. .
Step 2. Nitrogen. . One mole of amine gives one mole of , so .
Step 3. Ethanol. .
Answer: , and .
Check. The two nitrogen atoms of each molecule come one from the amine and one from the nitrite.
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