To determine the number of molecules in 1.4 moles of MnCl₂, you can use Avogadro's number, which states that one mole of any substance contains approximately \(6.022 \times 10^{23}\) entities (atoms, molecules, ions, etc.).
1 mole of MnCl₂ contains \(6.022 \times 10^{23}\) molecules.
Therefore, for 1.4 moles of MnCl₂:
\[ \text{Number of molecules} = 1.4 \, \text{moles} \times (6.022 \times 10^{23} \, \text{molecules/mole}) \]
\[ \text{Number of molecules} \approx 8.43 \times 10^{23} \, \text{molecules} \]
So, there are approximately \(8.43 \times 10^{23}\) molecules in 1.4 moles of MnCl₂.