Answer:
Mass = 199.2 g
Step-by-step explanation:
Given data:
Mass in gram = ?
Number of atoms of C-12 = 100 atom
Solution:
First of all we will calculate the number of moles of C-12 in 100 atoms by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ atoms
100 atoms×1 mol / 6.022 × 10²³ atoms
16.6× 10²³ moles
Mass of C-12:
Mass = number of moles × molar mass
Mass = 16.6 × 10²³ mol × 12 g/mol
Mass = 199.2 g