Answer:
0.618 moles ZnCl2
Step-by-step explanation:
Divide the 84.23 g by the total grams in one mole. You can find how many grams in 1 mole (molar mass) by adding the average atomic masses of the compound. For ZnCl2 65.39+35.45+35.45 = 136.29 g/mol. Then divide that by the grams you have.