One mole of iron A. is heavier than one mole of lead (Pb). B. is 77.0 g of iron. C. is 26.0 g of iron. D. weighs the same as one mole of lead. E. None of the above.

E. None of the above.

Explanation:

Given 1 mole of iron. We need to find the mass of the iron. And we will compare mass of the iron with the given options.

The molar mass of the iron is 55.845 g/mol.

So, for 1 mole the mass of the iron would be

Also, the molar mass of the lead is 207.2 g/mol.

So, for 1 mole the mass of the lead would be

We can see that one mole of lead is heavier than one mole of iron. So, the only option is correct is  E. None of the above.

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