Final answer:
To calculate the number of moles represented by a given number of formula units of MgCl2, divide the number of formula units by Avogadro's number. In this case, it is equal to 58.8 moles.
Step-by-step explanation:
To calculate the number of moles represented by a given number of formula units, we need to use Avogadro's number and the molar mass of the substance. In this case, we have 3.54x10^25 formula units of MgCl2. First, we need to calculate the molar mass of MgCl2, which is 95.21 g/mol. Then, we can use the formula:
Number of moles = Number of formula units / Avogadro's number
Number of moles = (3.54x10^25) / (6.02x10^23) = 58.8 moles