Calculate the mass (in grams) of 3.913 x 1023 molecules of AICI3

Answer: 85.8 g AlCl3

Explanation:

Convert molecules of AlCl3 to moles using the Avogadro's number

Convert moles of AlCl3 to mass using its molar mass.

3.913x10²³ molecules AlCl3 x 1mole AlCl3 / (6.022x10²³ molecules AlCl3) X 132g AlCl3 / 1 mole AlCl3

= 85.8 g AlCl3