"Each/every 5 ml contains..." - which is correct?

I have spent the better part of the morning trying to find duplicates which incorporate both usages, and the only relevant posts that I see do not address the OP on both issues..

We have:

each/every

and

verb agreement with units

I cannot find an exact duplicate on EL&U. However, both usages taken on their own are normally considered singular for verb agreement.

""Each/Every 5 ml of the solution contain..."

From MetaEd r.e. each/every

One is singular, so one of you is singular, so each and every one of you is singular.

From ect r.e. verb agreement with units

These constructions are called "mass nouns" (or something comparable). Although they refer to more than one thing (e.g., more than one milliliter of water), they treat these things as a single unit.

It should be:

Each/every 5 ml of the solution contains...

*Note that post "verb agreement with units" still does not have an accepted answer...

The problem is the otiose "each/every", which serves no purpose because it is impossible that some 5mils of the solution will contain more or less.

It is better to say "5 millilitres of syrup contain/contains 3400mg of sucrose" (it does not matter which - 5ml can be seen as a single unit or plural millilitres.

The solution is "One millilitre of syrup contains 680mg of sucrose"

It's as correct to use '5ml' as a unit of distribution as it is to use 'a pint' as a unit of distribution of beer.

In the British system a pint consists of 20 fluid ounces so, talking of 5% ABV beer it would be correct to say that "each (or every) pint contains a fluid ounce of alcohol".

'Each' is used to concentrate on individual units of distribution (what each consumer of one unit gets) while 'every' is used to concentrate on the consistency of the manufacturing process.

The Cadbury chocolate company used to advertise it's milk chocolate bar by placing the slogan "A glass and a half into every creamy half pound" above or below a picture of glasses of milk being 'poured' into a chocolate bar. It's the same usage emphasising consistency.