For the equation:
deltaHrxn = qrxn / mol substance to calculate deltaH per mole
what does the mol substance mean? Does this mean that you use the mm of the substance or if you already calculated the # of moles of a substance do you use that?
The term "mol substance" refers to the number of moles of a specific substance involved in the chemical reaction. It represents the stoichiometric coefficient of the substance in the balanced equation.
When using the equation ΔHrxn = qrxn / mol substance, you need to use the number of moles of the substance involved in the reaction. This can be determined in two ways:
1. If the number of moles of the substance is given: If you already know the number of moles of the substance involved in the reaction, you can directly use that value to calculate ΔH per mole. Just substitute the known value of mol substance into the equation.
2. If you know the mass of the substance: If you have the mass of the substance, you can convert it to moles using the molar mass (mm) of the substance. To do this, divide the mass of the substance by its molar mass to obtain the number of moles. Then you can use this value in the equation ΔHrxn = qrxn / mol substance.
In summary, the "mol substance" refers to the number of moles of a substance involved in the reaction. You can get this value either by using the given number of moles or by converting the mass of the substance to moles using its molar mass.