Question

calculate weight of 20sodium atoms in grams​

Answer 1

Explanation:

In the periodic table of elements, you'll see each element's atomic weight listed. Scientists use atomic mass units (amu) to describe the mass of atoms, so think of atomic weights in terms of amus. Avogadro's constant -- 6.02 x 10^23 -- describes the number of atoms in a mole of an element. Weighing a sample of an element gives you its mass in grams. If you have all three pieces of information -- atomic weight, grams and Avogadro's number -- you can calculate the number of atoms in the sample.