Question

If a sample of barium contains 2.3 x 1023 atoms of barium, how many grams of barium are in the sample?

0.38 g

2.62 g

52.4 g

359.5 g

Answer 1

What is the relationship between the # of particles and their mass? Should be a big ##

Answer 2

n(number of moles)=2.3*10^23/6.02*10^23[known as Avogadro constant]=0.381 mol
so the mass is m=n*N=0.381mol*137g/mol

Answer 3

it's about 52.4