Thermodynamics ...

Hess's law of constant heat summation in based on: 

Hess law of heat summation includes 

In the reaction for the transition of carbon in the diamond form to carbon in the graphite form, $$\Delta H$$ is -453.5 cal. This points out that 

Gibb's free energy (G) is defined as:

Conditions of standard state used in thermochemistry is?

$$C+O_{2}\rightarrow CO_{2}+94.2 kcal$$
$$H_{2}+1/2O_{2}\rightarrow H_{2}O+68.3 kcal$$

$$CH_{4}+2O_{2}\rightarrow CO_{2}+2H_{2}O\left ( g \right
)+210.8kcal$$

Then the possible heat of formation of methane will be 

Which of the following is slow process

In the Born-Haber cycle for the formation of solid common salt (NaCl), the largest contribution comes from :

If enthalpy of an overall reaction $$X \rightarrow Y$$ along one rout is $$\Delta H$$ and $$\Delta H_{1}, \Delta H_{2}, \Delta H_{3},....$$ representing enthalpies of reactions leading to same product Y then $$\Delta H$$ is

The statement "The change of enthalpy of a chemical reaction is same whether the reaction takes place in one or several steps" is