Moles are the unit used for defining an atom or molecule present in a substance. It is represented by mol.
3.012 x 10⁻⁴ mol of [tex]\rm Na_{2}CO_{3}[/tex] are present.
How are moles calculated ?
Moles are the quantity present in a mass of a substance proportionate to the molar mass of the substance.
[tex]\rm Moles (n)= \dfrac{Mass (m) }{Molar\; mass (M)}[/tex]
Given,
- Mass (m) = 0.025 g
- Molar mass of [tex]\rm Na_{2}CO_{3}[/tex] = [tex]23+12+(16\times 3)[/tex]
- M = 83
Inserting values:
[tex]\begin{aligned}\rm m &= \dfrac{0.025}{83}\\\\&= 0.0003012 \;\rm mol\\\\&= 3.012 \times 10^{-4}\;\rm mol\end{beligned}[/tex]
Therefore, 3.012 x 10⁻⁴ mol of [tex]\rm Na_{2}CO_{3}[/tex] is present.
Learn more about moles here:
https://brainly.com/question/1196011
