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Converting mol to g question :)

What mass of potassium permanganate (KMnO4) solid is present in 500cm3 of 0.02 mol dm^-3 KMnO4 (aq)?
So I'm assuming that as this is a mass question, I need the answer in grams. I've got that in mol but I'm a bit stuck as to how to convert it...
Any help would be much appreciated, thanks! :smile:
Reply 1
BUMP! Sorry, I'm just really stuck and all my Chem friends are out tonight. Anyone coming to my aid? Please? I have cookies..
Reply 2
Moles = mass / Relative Molecular Mass (mass of 1 mole)

So, you have 0.02 x 0.5=0.01 moles
RMM of KMnO4 = 39+55+16x4 =158

Mass = 0.01 x 158 = 1.58g
Reply 3
Oooohhh. Ahhh. Okay. Thank you :smile:

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