Convert 7.17 × 10 to the 21st molecules of iron to grams of iron

Answer 1

To convert molecules of iron to grams, we need to use the Avogadro's number.

1 mole of iron contains 6.022 x 10^23 iron atoms.

So,
7.17 x 10^21 molecules of iron = (7.17 x 10^21) / (6.022 x 10^23) moles of iron

= 1.19 x 10^-2 moles of iron

Now, we need to find the molar mass of iron, which is approximately 55.845 g/mol.

Finally, to convert moles to grams, we use the formula:

grams = moles x molar mass

grams = 1.19 x 10^-2 mol x 55.845 g/mol

grams = 0.666 g

Therefore, 7.17 x 10^21 molecules of iron is equal to 0.666 grams of iron.