What is my Enthalpy?

Chemistry Level 2

A calorimeter (from Latin calor, meaning heat) is an object used for calorimetry, or the process of measuring the heat of chemical reactions or physical changes as well as heat capacity. If the thermochemical equation for the production of hydrochloric acid is

1 2 H X 2 ( g ) + 1 2 C l X 2 ( g ) → H C l ( g ) , Δ H = − 92.3 kJ \frac{1}{2}\ce{H_2}(g)+\frac{1}{2}\ce{Cl_2}(g) \to \ce{HCl}(g),\quad \Delta H=-92.3 \text{ kJ}

then what is the enthalpy of 36.5 grams of hydrochloric acid at 2 5 ∘ C 25^\circ C of temperature and 1 atm 1\text{ atm} of pressure?

− 92.3 kJ -92.3 \text{ kJ} 0 kJ 0 \text{ kJ} 92.3 kJ 92.3 \text{ kJ} Cannot be measured

Lakshan Dumpa by Lakshan Dumpa , 24, India

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1 solution

Mayank Holmes
May 15, 2014

you can only measure the change in enthalpy and not the enthalpy! it's just like the case with entropy........

2 Helpful 0 Interesting 0 Brilliant 0 Confused

I think absolute entropy is defined with help of third law....but ya only change in enthalpy is defined.

Athul Nambolan - 6 years, 3 months ago

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