Hey there! :
Molar mass:
Al = 26.9815 g/mol
AlCl₃ = 133.3405 g/mol
Reaction stochemistry ,calculates the mass of AlCl3 produced
2 Al + 3 Cl₂ = 2 AlCl₃
2 * 26.9815 g Al --------------------- 2 * 133.3405 g AlCl₃
8.82 g Al ------------------------------- ( mass of AlC₃ )
mass of AlCl₃ = ( 8.82 * 2 * 133.3405 ) / ( 2 * 26.9815 )
mass of AlCl₃ = 2352.12642 / 53.963
mass of AlCl₃ = 43.58 g of AlCl₃
Hope this helps!