Question

calculate the no. of particles in 36g of C atoms​

Answer 1

Answer:

In chemistry a ‘mole of atoms’ is the Avogradro number of atoms.

The Avogadro number (6 x 10^23) is the number of atoms which has a mass equal to the element’s relative atomic mass in grams.

So, look at the periodic table your teacher gave you and find carbon on it. it should have two numbers - a 6, which is the atomic number, and a 12 (or 12.0107 or something). That’s the relative atomic mass. That’s how many times the mass of that atom is compared to 1/12 of the mass of a carbon-12 atom (a strange definition I know)

The relative atomic mass of carbon may be shown as 12.0107 because that’s the AVERAGE mass. Most carbon is the carbon-12 isotope, which weighs 12, but a small amount is carbon-14, which weighs 14, so the average is 12.0107.

For the sake of this exercise, I guess your teacher wants you to ignore carbon-14, so use 12 as the relative atomic mass of carbon.

So, back to what a mole is - it’s the number of atoms which weigh its relative atomic mass in grams.

For instance, oxygen’s relative atomic mass is 16 (ish), so 1 mole of oxygen will weigh 16 grams.

Get it?

So, 1 mole of carbon (whose relative atomic mass is 12) weighs how many grams? It’s not hard.

Once you’ve got that, it should be an easy step to work out how many moles weigh 36 grams.