### Instruction: What is the molecular weight of 9 moles of Aluminium sulfide Let's write a Python program to solve it.### Response: # Chemical formula of Aluminium Sulfide - Al2S3

molecular_weight_Al = 27
molecular_weight_S = 32

no_of_Al = 2
no_of_S = 3

weight_per_mole = (no_of_Al * molecular_weight_Al) + (no_of_S * molecular_weight_S)

no_of_moles = 9
total_weight = no_of_moles * weight_per_mole

print(total_weight)