how much heat (in KJ) is released when 2.50 mols of NaCl is dessolved in water?

To determine the amount of heat released when 2.50 moles of NaCl is dissolved in water, we need to know the molar enthalpy of dissolution (∆H) of NaCl. The ∆H value represents the heat released or absorbed during the dissolution process.

Unfortunately, the molar enthalpy of dissolution of NaCl is not provided in the question. However, we can make an estimation by using the average molar enthalpy of dissolution (∆H°) for NaCl, which is -3.9 kJ/mol.

To calculate the amount of heat released, we can use the following formula:

Heat released = (∆H°) x (number of moles)

Heat released = (-3.9 kJ/mol) x (2.50 mol)

Heat released = -9.75 kJ

Therefore, approximately 9.75 kJ of heat will be released when 2.50 moles of NaCl is dissolved in water, assuming an average molar enthalpy of dissolution (∆H°) of -3.9 kJ/mol.