Question

What is the mass of 4.20 mol of the element iron (Fe)? *

2 points

235g Fe

55.8g Fe

134g Fe

6.02x1023g Fe

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Answer 1

Answer:

If you look into your periodic table, the molar mass of Fe is 55.9 g/mol. The mass (m) of Fe is: [ 55.9 g/mol × 4.50 moles ] = 251.6 grams. So, the result will be 235g Fe.

Explanation:

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Answer 2

Given: 4.2 moles of iron.

To find: We have to find its mass.

Solution:

To determine the mass of 4.2 moles of iron we have to follow the below steps as follows-

The symbol of iron is Fe. It has an atomic mass of 55.8 grams.

Thus we can write,

One mole of iron has a mass of 55.8 grams.

Thus 4.2 moles of iron has a mass of 55.8×4.2=234.36 grams or 235 grams.

Thus 4.2 moles of iron has a mass of 235 grams.