[HerrSwampy]

Hello, in my psychical chemistry lab we had done crysocopy exercise and i need to indentify chemical based on thesee informations:

molar mass: 45,21088 g/mol
white powder, easily made tablets with just pressure
Easily dissolves in water

Thanks for an help

[Babcock_Hall]

What are your thoughts?

[HerrSwampy]

It could have been MgO, but i am not sure at all

[mjc123]

If it was psychical chemistry, you should just know.

[HerrSwampy]

Sadly it was cryoscopy, and they just gave us the chemical and told us to find its molar mass and try to think what chemical it is

[Borek]

It could have been MgO, but i am not sure at all

Would MgO easily dissolve in water?

molar mass: 45,21088 g/mol

If it is your experimental value, it opens many more options. What is the heaviest element that the compound can contain? It is a compound, how many elements minimum does it contain? If so - what are possible molar masses of these element? Which elements fit? It is soluble - does it limit the selection of compounds? And so on.

Plus: often you are given a list of compounds to choose from.

[HerrSwampy]

We were not given a list and yeah it was a experimental value of molar mass, so it could slightly different, I basicly need some idea that is closest to it

[Borek]

Can't think of anything else than trial and error building on the ideas I listed - or finding on the web a database of compounds and searching it for compounds with similar molar mass.

[Orcio_87]

MgO would give an alkaline solution and its molar mass (40 g) differs from yours (45 g). There are other compounds that fit better - LiCl, Li₂S and NaF.