Question

Calculate the mass and moles of iodine that reacted in the formation of 2.7132 grams of ZnI2.

im slighty confused about the use of iodine, would it be diatomic in the equation for example would i use the conversion
1 mol ZnI2 = 1 mol I2
or
1 mol ZnI2 = 2 mol I

Answer 1

I2 is diatomic.

Zn + I2 ==> ZnI2
Use 1 mol I2 = 1 mol ZnI2. If you wanted mols I ATOMS, then 1 mol ZnI2 = 2 mol I atoms.