Could someone confirm that this is correct? !

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.

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 :

Total mass on the product side :

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

1. 1 mole of anything contains 6.022x10^23 pieces  

d  

2. a  

3. c, number  

5. 1.24x10^24atoms / 6.022x10^23atoms/mole = 2moles h2 atoms  

6. fe2br3 mass = 2moles x mass fe + 3 moles x mass br  

molar mass = grams / number of moles = g/mole  

to find moles = g / molar mass  

to find mass = g = molar mass / moles

answer; protein;