First balance the equation: you get 3Fe + 4H2O = Fe3O4 +4H2O
Then set up the equations according to the spidey map below.
x 10^25 molec. H2O/ 1 x x x
Multiply the top all together, then divide by the whole bottom half.
Answer: 154.4 g H2
136 g Fe /1 x
x
x ![\frac{6.02(10x^{23}) molec. Fe3O4 }{1molFe3O4}](https://tex.z-dn.net/?f=%5Cfrac%7B6.02%2810x%5E%7B23%7D%29%20molec.%20Fe3O4%20%7D%7B1molFe3O4%7D)
Multiply the top all together, then divide by the whole bottom half.
Answer: 4.95 x 10^20 Formula units (fu) Fe3O4
8.25 x 10^23 molec. Fe/ 1 x
x
Multiply the top all together, then divide by the whole bottom half.
Answer: 1.83 mol H2