What will be the mass of one atom of C-12 in grams?

 

The mass of a carbon-12 atom was determined by a mass spectrometer and found to be equal to 1.992648×10-23g. It is known that 1 mole of C-12 atom weighing 12 g contains NA number of atoms. Thus,
1moleofC-12atoms=12g=6.022×1023atoms
6.022×1023atomsofC-12havemass=12g
1atomofC-12willhavemass=126.022×1023g
=1.992648×10-23g1.99×10-23g