29Apr/10Off
Acid Pure
Acid Pure
How many millimoles of benzoic acid (fw= 122.1g) are contained in 1.5g of the pure acid?
I don't even know were to start...
Start like this - think it through logically:
If you had 122.1g you would have 1 mol of benzoic acid.
But you have only 1.5g - which is a small fraction of a mol. What fraction?
moles in sample = 1.5/122.1 = 0.0123mol
This is the moles you have, but you want millimoles, or mM
So you multiply by 1000:
0.0123 x 1000 = 12.3mM That is your answer. Easy when you think and work logically.
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