Can someone please help me with this

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.

154.4 g H2

136 g Fe /1 x x x

Multiply the top all together, then divide by the whole bottom half.

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.

1.83 mol H2

the answer is true.

the electrical  conductivity  of asolution  of an electrolyte is measured by determining the resistance of thesolution  between two flat or cylindrical electrodes separated by a fixed distance.