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Identifying unknown chemical

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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

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