Question

Calculate the mass in grams of iodine (I2) that will react completely with 27.1 g of aluminum (Al) to form aluminum iodide (AlI3).

Answer 1

the equation of reaction is
I                  +              Al---------->  AlI3
1 mol                                              1mol
n mol                                              n mole
so nI =nAll3

nAll3=mAll3/M= 27.5g/27+3x127=0.067mol

and then  nI=0.067mol = mI/MI
from where we can get  mI=nIxMI=0.067x 127=8.56g