Question

How many grams are in 2.30 x 10^23 atoms in Na?

Answer 1

There are 8.786 g

Further explanation

The mole is the number of particles contained in a substance

1 mol = 6.02.10²³

2.30 x 10²³ atoms in Na :

$\tt mol=\dfrac{2.3\times 10^{23}}{6.02\times 10^{23}}=0.382$

mass :

$\tt mass=mol\times Ar~Na\\\\mass=0.382\times 23=8.786~g$