Question

Could someone confirm that this is correct? Thanks!

Answer 1

Explanation:

Law of conservation of mass states that mass can neither be created nor be destroyed but it can only be transformed from one form to another form.  

This also means that total mass on the reactant side must be equal to the total mass on the product side.

$4Al+3O_2\rightarrow 2Al_2O_3$

Atomic mass of aluminum = 27 g/mol

Molar mass of oxygen gas = 32 g/mol

Molar mass of aluminium oxide = 102 g/mol

Total mass on the reactant side : $4\times 27g/mol+ 3\times 32 g/mol=204 g/mol$

Total mass on the product side : $2\times 102g/mol=204g/mol]$

Total mass on the reactant side = Total mass on the product side.

Answer 2

Your sheet is correct