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Start on Do or C. I will do it in letters. C G E B G E A G E B C D C and repeat. Now for Do re mis (1 stands for key before do) Do So Fa Ti1 So Fa La1 So Fa Ti1 Do Re Do. Sorry If I'm not much of a good explainer. You should start off with the 2nd Do from the Right. Good Luck!
The conversion factor you need for this problem is the atomic mass of arsenic.74.9 gram arsenic = 1 mole arsenicSince you want to end up in units of moles of As, this goes in the numerator (on top). You want to convert from grams As, so this goes in the denominator (on the bottom).grams As1 mole As = moles As74.9 gram As