Question

Find the mass of Al2O3 that will be formed when 9g of Al burns in 16g of O2.


PLEASE ANSWER .​

Answer 1

from the above equation we can see 4 Al atoms react with 3 molecules of O2 to make 2 molecules of Al2O3

9g Al = ⅓ moles of Al

16 g O2= ½ moles of O2

so here 4(1/12)Al + 3(1/12) O2=> 2(1/6) Al2O3

that means ⅓ moles of Al2O3 will be formed

molar molar mass of aluminium oxide= 102 g

mass of ⅓ moles of Aluminium oxide = 34g