Question

How many moles of atoms are contained in 0.8gm of iron

Answer 1

See the Molar mass of iron is 55.845

So 1 mole of iron contains 55.845 grams of iron

So no of moles of iron in 0.8 grams of iron is 0.8/55.85 which is approximately equal to 0.014324 moles 

Now if you want to calculate the no of atoms present in 0.8 grams of iron

So 1 mole of a substance contains 6.022×102323 atoms/molecules so 0.014324 moles will contain 0.014324×6.022×102323 atoms.

i.e 0.086259×102323 atoms of iron which is approximately equal to 86.259×102020 atoms.

Answer 2

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