If you have 25.4 g Fe, how many moles and atoms are in the sample?
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No. Of moles=mass/atomic mass
Keep this formula in mind and use to find your answer for no. Of moles of iron whose atomic weight is 56gram
56gram of iron contains 6.02×10^23atoms
So, 25.4 gram of iron will contain 25.4×6.02×10^23 /56
Find the answer from it.
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