Question

What would be gram atomic mass of 5 moles of chlorine

Answer 1

The periodic table is a weirdly shaped table with information about all the elements we've discovered so far. It gives you lots of info but I will only focus on what is necessary to answer your question here. Each "box" in the table is an element. This particular periodic table lists the atomic number (top left of box), the element's symbol (in bold), the element's name, and the atomic mass. For the purposes of your question, you only have to look at the atomic mass at the bottom of the box.


If you look at the chlorine box, with the symbol Cl, you see the atomic mass is equal to 35.453 atomic mass units. This is the weighted average mass of chlorine, including its isotopes, as found in nature. This also means that one mole of chlorine atoms has a mass of 35.453 grams. A mole is just a name for a certain number, much like a dozen is just a name for 12. A mole of something means that you have 6.023 x 10^23 units of that something, just like a dozen of something means that you have 12 units of that something. So if you have a mole of Cl atoms you have 6.023 x 10^23 atoms of Cl. Since a mole of chlorine atoms has a mass of 35.453 grams, then a weighted average mass for one of those atoms will be equal to (34.453 grams/mole ÷ 6.023 x 10^23 atoms/mole =) 5.720 x 10^-23 grams per atom (notice the negative sign). That's a very small mass! It is 5.7 millionths, of a millionth, of a millionth, of a hundred-thousandth of a gram. To get a feel for how small that number is: Comparing the mass of a Cl atom to the mass of a 6 foot tall man, is like comparing the mass of about 3/4 of a teaspoon of sugar to the mass of the entire earth!!

Answer 2

1 mole of Cl = 35.5 u

5 mole of Cl= 35.5 ✖ 5

= 177.5 gm

Hope these answer will help you.