Reply To: Thermochemical equations UEB NEM CHEM Home › Forums › Nemeth Code for Math and Science › Thermochemical equations UEB NEM CHEM › Reply To: Thermochemical equations UEB NEM CHEM November 17, 2018 at 4:38 pm #32377 kdejuteModerator Your instances of “Delta H equals something” are separate equations. Each should be preceded by a space to separate them from the chemical reaction. (Delta H etc. is an expression of the change that happened in the preceding reaction.) –Kyle