Respuesta :

michell96

The one that contains the fewest atoms is Rb or Rubidium.

How do you calculate the number of atoms?

The number of atoms can be calculated using the following formula:

  • mass of the substance/ atomic mass units (AMU) x Avogrado's number

Now, let's calculate the mass for all the elements:

  • 4.0 g Li
  • 4.0g Li/ 6.94 g/mol x  6.02  10²³
  • 0.57 x  6.02 x 10²³
  • 3.43 x 10²³

  • 4.0 g Na
  • 4.0g Na/ 22.98 g/mol x  6.02  10²³
  • 0.17  x 6.02 x10²³
  • 1.02 x 10²³

  • 4.0 g Rb
  • 4.0 g Rb/ 85.46 g/mol x  6.02  10²³
  • 0.04 x 6.02 x 10²³
  • 2.4 x 10²²

  • 4.0 g Ca
  • 4.0 g Ca / 40.07 g/mol x  6.02  10²³
  • 0.09x 6.02 x 10²³
  • 5.41 × 6.02²²

From these options, the lowest number is 2.4 x 10²² which refers to Rubidium. and therefore, this is the option with the least atoms.

Note: This question is incomplete because the options are missing; here are the options:

A) 4.0 g Li

B) 4.0 g Na

C) 4.0 g Rb

D) 4.0 g K

E) 4.0 g Ca

Learn more about atoms in: https://brainly.com/question/13981855

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