I had to conduct an experiment to find the enthalpy of reaction for :

4Fe + 3O2 + 6H2O ----> 4Fe(OH)3
In the experiment , I started with an inital temperature of 22.3 C and edned with 36.7 C so the delta T is +14.4C.
Now it's telling me to calcualte the delta Hrxn for the reaction but how can I do that in I don't have mass or specific heat? I tried to use the mass of 4Fe(OH)3 and the specific heat of Iron but I keep getting a positive result and delta H should be negative because this reaction is exothermic. Please Help!

To calculate the enthalpy change (ΔHrxn) for a reaction, you need to use Hess's law or the calorimetry equation. However, in this particular case, it seems like you have incomplete information, as you mentioned that you don't have the mass or specific heat values.

To determine the enthalpy change, you typically need the mass of the reactants and/or the products involved in the reaction. Without this information, it can be challenging to accurately calculate the enthalpy change for the reaction. Therefore, you might need to gather additional data or consult your experiment instructions to obtain the missing information.

In your case, you can try to determine the mass of the products (4Fe(OH)3) that were formed during the reaction. Once you have the mass, you can then use the specific heat of iron (Fe) to calculate the enthalpy change. Keep in mind that the specific heat values might differ between iron and iron hydroxide, so ensure you are using the correct values.

If you are unable to obtain the missing data or specific heat values, you may need to consult your teacher or experiment instructions for further guidance on how to proceed. They might be able to provide additional information or suggest an alternative method for calculating the enthalpy change.