What is the mass in grams a single atom of carbon C?

Answer 1

That depends on which element you are speaking of. I'm going to give you an example for the hydrogen isotope protium, which has one proton and one electron.

The Atomic Mass for the protium isotope of hydrogen is 1.008*

We use the relative atomic mass in conjunction with a special term called a mole, which is defined as being Avogadro's number of atoms (which is a special number discovered by Avogadro).

Avogadro's number is 602,214,150,000,000,000,000,000; or 6.0221415 x 1023

This is useful because 1 mole of an element is as many grams as the element's relative atomic mass.

So 1 mole of protium is 1.008g and consists of an equivalent number of atoms as Avogadro's number.

So 1.008g of protium is 602,214,115,000,000,000,000,000 atoms of protium!!!

Using this we can find how much one hydrogen atom weighs in grams:

1.008 / 6.0221415 x 1023 = 0.0000000000000000000000016738g

Or 0.0000000000000000000016738mg (milligrams)

Or 0.0000000000000000016738μg (micrograms)

Or 0.0000000000000016738ng (nanograms)

Or 0.0000000000016738pg (picograms)

Or 0.0000000016738fg (femtograms)

Or 0.0000016738ag (attograms)

Or 0.0016738zg (zeptograms)

Or 1.6738yg (yoctograms)

Answer 2

The answer is approx. 2.10ex-23 grams.

Answer 3

5.8x10^-23