Internal energy, enthalpy and entropy are thermodynamics state functions.
Calculate enthalpy of combustion of methane, given that the standard enthalpies of formation of `CH_4`, `CO_2` and `H_2O` are -75.2, -394.0 and -285.6 kJ//mol respectively.

Internal energy, enthalpy and entropy are thermodynamics state functions. What is enthalpy of a system?

a) Predict whether entropy increases or decreases in the following changes: i) l_2(S)rightarrowl_2(g) ii) Temperature of a crystalline solid is raised from 0 K and 115 K. iii) Freezing of water b) Calculate the enthalpy of combustion of methane. Given that standard enthalpies of formation of CH_4,CO_2 and H_2O are -75.2, -394 and -285.6 kJ/mol respectively.

Standard molar enthalpy of formation of 'CO_2', is equal to

Calculate the standard enthalpy change for the reaction CH_4(g) +2O_2(g) rarr CO_2(g)+2H_2O(l) Given that the standard enthalpies of formation of CH_4(g),CO_2(g), and H_2O(l) are -74.8 kJ mol^-1, -393.5 kJ mol^-1 and -285.8 kJ mol^-1 respectively.

Which of the following equations represents enthalpy of formation of 'H_2 O ?'

Given that N_2(g)+3H_2(g)rarr2NH_3 Delta_rHtheta=-92.4 What is the sandard enthalpy of formation of NH_3 gas?