Match the correct mole ratio to the substances in the reactions below.

carbon monoxide to iron in the reaction: Fe2O3 + CO ==> Fe + CO2

water to manganeese(II) chloride in the reaction: HCl + MnO2 ==> H2O + MnCl2 + Cl2

sodium to oxygen in the reaction: Na + O2 ==> Na2O

copper to iron in the reaction: Fe + CuSO4 ==> FeSO4 + Cu

First, you must balance the equation. (I assume you must balance the equation; it doesn't make sense to list mol ratios for equations that won't work.) Then you look at the coefficients of the material in the equation.

Fe2O3 + 3CO ==> 2Fe + 3CO2

Now, carbon monoxide, CO, is to iron, Fe, as 3/2.
The others are done the same way.

To find the correct mole ratio for each reaction, we first need to balance the equations. Once balanced, we can then determine the mole ratio by comparing the coefficients of the substances involved. Let's go through each reaction and find the correct mole ratio:

1. Balancing the equation:
Fe2O3 + 3CO -> 2Fe + 3CO2

The mole ratio between carbon monoxide (CO) and iron (Fe) is 3:2. This means that for every 3 moles of CO, 2 moles of Fe are consumed.

2. Balancing the equation:
HCl + MnO2 -> H2O + MnCl2 + Cl2

The mole ratio between water (H2O) and manganese(II) chloride (MnCl2) is 1:1. This means that for every 1 mole of H2O produced, 1 mole of MnCl2 is formed.

3. Balancing the equation:
2Na + O2 -> 2Na2O

The mole ratio between sodium (Na) and oxygen (O2) is 4:1. This means that for every 4 moles of Na, 1 mole of O2 is consumed to form 2 moles of Na2O.

4. Balancing the equation:
Fe + CuSO4 -> FeSO4 + Cu

The mole ratio between copper (Cu) and iron (Fe) is 1:1. This means that for every 1 mole of CuSO4 used, 1 mole of Fe is needed to produce 1 mole of Cu.

By balancing the equations and comparing the coefficients, we can determine the correct mole ratios for each reaction.