Question

Calculate the mass of 1.25 moles of Al2(SO4)3

Answer 1

If we convert 1.25 into grams and round it up the answer will be 427.7

Answer 2

Total molar mass of Al2(SO4)3:

2(27)+3(32.1)+12(16) = 342.3

the mass of Al2(SO4)3:
number of moles times molar mass
= 1.25 times 342.3
= 427.875 kg