How to Calculate Molar Mass and Atomic Weight?

What is the weight of 6 moles of iron atoms?

And how many atom-grams are there in 540 grams of aluminum (Al)?

Answer:

The weight of 6 moles of iron atoms is 335.1 grams. And there are 20 moles of aluminum in 540 grams.

To calculate the weight of 6 moles of iron atoms, we need to use the molar mass of iron, which is 55.85 grams per mole. By multiplying the number of moles (6 moles) by the molar mass of iron, we get the weight in grams (335.1 grams).

On the other hand, to determine the number of atom-grams in 540 grams of aluminum (Al), we first need to know the molar mass of aluminum. Assuming Al represents aluminum with a molar mass of 26.98 grams per mole, we can calculate the number of moles in 540 grams of aluminum. By dividing the mass by the molar mass, we find that there are 20 moles of aluminum in 540 grams.

Understanding molar mass and atomic weight is crucial in chemistry as it helps us determine the mass of a specific number of atoms or molecules. Molar mass is the mass of one mole of a substance, while atomic weight is the average mass of an element's isotopes.