Asked by Lex

Porassium alum is 3.9 parts per 100 parts of water. Knowing this, how many moles of potassium alum are present in 50ml?
Answered by DrBob222
Since 50 is 1/2 of 100, wouldn't that be 3.9/2 = ? pars alum
Then convert g alum to mols alum.
Answered by Antoinette
Calculate the frequency of this radiation. The wavelength is 640 nm?
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