We are given the equation 3CO(g) + Fe2O3(s)= Fe(s) + 3CO2(g) and determine the next step in balancing the equation. In this case,C is already balanced. The next step is to balance Fe so we put 2 before Fe (s) to balance the 2 atoms in the left of the equation.
To solve this we use the equation,
M1V1 = M2V2
where M1 is the concentration of the stock
solution, V1 is the volume of the stock solution, M2 is the concentration of
the new solution and V2 is its volume.
65 x V1 = 2 x 200 L
V1 = 6.15 L
The answer you are looking for is A. If you need me to show you how I got the answer let me know. :)
