Thermodynamics ...

What wiII be the heat of formation of methane, if the heat of combustion of carbon is $$'-x' kJ$$, heat of formation of water is $$'-y' kJ$$ and heat of combustion of methane is $$'z' kJ$$?

For the reaction of one mole of zinc dust with one mole of sulphuric acid in a bomb calorimeter, $$\triangle U$$ and $$w$$ corresponds to:

If $$Q$$ and $$W$$ represent the heat supplied to the system and the work done on the system respectively, then the first law of thermodynamics can be written as:

Gibbs- Helmholtz equation is:

What is the characteristic of a material which undergo spontaneous combustion?

The enthalpy of formation of $$CO_{(g)}, CO_{2(g)}, N_{2}O_{(g)}$$ and $$N_{2}O_{4(g)}$$ is $$-110, -393, +811$$ and $$10\ kJ/ mol$$ respectively. For the reaction, $$N_{2}O_{4(g)} + 3CO_{(g)} \rightarrow N_{2}O_{(g)} + 3CO_{2(g)} \cdot \triangle H_{r} (kJ/mol)$$ is

According to the first law of thermodynamics which of the following quantities represents the change in a state function?

Statement 1 : Candles can be safely stored at room temperature, even though their reaction with air is spontaneous at room temperature.
Statement 2 : The reaction that takes place when a candle is burned involves a decrease in entropy.

Match list I with list II and select the correct answer using the codes given below the lists:

For the reaction, $$X_2Y_4(l) \longrightarrow 2XY_2(g)$$ at 300 K, the values of $$\Delta U$$ and $$\Delta S$$ are 2 kcal and 20 cal $$K^{-1}$$ respectively. The value of $$\Delta G$$ for the reaction is