When 10.00 g of iron is burned in O2(g)to form Fe3O4 (s) , enough heat is generated to raise the temperature of 784 g of water from 18.0 C to 38.0 C.

Question

Calculate the heat of formation of Fe3O4 (s) under these conditions in kJ/mol.

Answer 1

Assume you have one mole of FeO.Fe2O3

Find the mol mass of that.

Then find how many moles you have in 10g

heatformation= masswater*specificheat*20C/molesFeO.Fe2O3

Answer 2

I got 1518 kJ/mol using that equation, but I still got it wrong. Did I do something wrong?

Answer 3

Let me see your data.
molesIronoxide= ...
specific heat constant....

Answer 4

0.04319 moles F3O4

Specific Heat Constant: 4.18 J/mol*C