Science
Chemistry Homework Help

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a.
Moles Nickel = atoms nickel over atoms per mole

moles nickel = 7.5 x l0^l5 over 6.02 x l0^23 = 1.25 x l0-8 moles, not very much

Now to get this number of moles into grams.

Grams Ni = #moles Ni times 58.7 grams per mole (from atomic wt. for Ni)

Grams Ni = l.25 x l0^-8 times 58.7 g/mole = 7.3 x l0-7 grams

b. C9H8O4 has a molar mass of 180 g/mol
convert 100.0 mg to grams and yu get 0.1 g

divide the 2 and you end up with mols = 1800 mols

multiply by avogradros number (6.022e23) and you end up with molecules.

1.08396e27 molecules of aspirin in the tablet

Please let me know if you need any clarification. I'm always happy to answer your questions.

vicky david (178)
University of Maryland

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