4Fe+302→2Fe2o3. how many moles of oxygen are needed if we have 8 moles of fe

For 8 moles of iron 6 moles of oxygen are required.

Explanation:

Given data:

Number of moles of oxygen needed = ?

Number of moles of Fe = 8 mol

Solution:

Chemical equation:

4Fe + 3O₂   →  2Fe₂O₃

Now we will compare the moles of iron and oxygen from balance chemical equation.

                         Fe         :          O₂

                          4          :            3

                          8          :          3/4×8 = 6

So for 8 moles of iron 6 moles of oxygen are required.

"standard molar enthalpy:

h2o ( liquid water ) : - 285.8 kj/mole

h2o ( water vapor ) : - 241.8 kj / mole.

δhrxn = - 241. 8 - ( - 285.8 )= -241.8 + 285.8 = 44.0

answer: 44.0 kj"