How many formula units of NiS are contained in a 430. g sample of the compound?
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Ni=59, S=32
R.M.M of NiS=59 + 32 =>91 g mol-1
Hence, 430 gm of compound contains, 430/91=>4.7252 formula units of NiS or 4.7252 mol of NiS.
1 mol of any compound contains 6.023 X 10^23 molecules.
Hence, 4.7252 mol contains 28.46 X 10^23 molecules or 2.846 X 10^24 molecules.
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