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Porassium alum is 3.9 parts per 100 parts of water. Knowing this, how many moles of potassium alum are present in 50ml?

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Since 50 is 1/2 of 100, wouldn't that be 3.9/2 = ? pars alum
Then convert g alum to mols alum.

Calculate the frequency of this radiation. The wavelength is 640 nm?

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