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.

The enthalpy change for the reaction is 1650 kJ . 2 Fe_2 O_3(s) rarr 4 Fe(s)+3 O_2(g) What is the enthalpy of formation of Fe_2 O_3(s) .

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.

a) The enthalpy of combustion of CH_(4(g)), C_(graphite) and H_(2(g)) at 298 K are - 890.3 kJ mol^-1 , - 393.5 kJ mol^-1 and -285.8 kJ mol^-1 respectively. Calculate the enthalpy of formation of CH_(4(g)).

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.

Calculate the standard free energy change for the reaction, Zn+ Cu^(2+) rarr Cu + Zn^(2+) Given that standard free energy (G°) for Zn2+(aq), Cu2+(aq), are -147.2 kJ mol-1 and 65.0 kJ mol-1 respectively.