Respuesta :

Answer:

Explanation:

Mole weight of Na2 0 =  (2 * 22.989 + 15.999) = 61.977 g/mole

26.7 g / 61.977 g/mole = .4308 moles

ech mole has 6.022 x 10^23 particles

6.022 x 10^23  parts/mole   * .4308 mole  = 2.59 x 10^23 particles