Question: how to find qrxn in chemistry?
Answer: qrxn = - qcalorimeter 3. Divide qrxn by the number of moles of the limiting reactant. Multiply by the coefficient of the LR in the balanced equation to get ∆E for the reaction as written. For either of these types of calorimetry (coffee-cup or bomb), once you know ∆H or ∆E, you can easily calculate the other.