Calculate the entropy change in surrounding when 1.0 mol of `H_2O(l)` is formed under standard conditions. Given `Delta_fH^o = -286 kJ mol^-1.`

Calculate the enthalpy change on freezing of '1.0 mol' of water at '10.0^circ C' to ice at '-10.0^circ C . Delta_( fus) H=6.03 kJ mol^(-1)' at '0^circ C .' 'C_p[H_2 O(t)]=7 5 . 3 J m o l^(-1) K^(-1)' 'C_p[H_2 O(s)]=36.8 J mol^(-1) K^(-1)'

Write the thermochemical equation corresponding to the standard enthalpy of formation of benzne. (Hint: Delta_fH^Theta of benzene = +49.0 kJ mol^-1 )

The standard heat of formation of CH_(4),CO_(2) and H_(2)O(l) (l) are -76.2 , -394.8 and -285.82 kJ mol^(-1) , respectively. Heat of vaporizatron of Water is 44 kJ mol^(-1) . Calculate the amount of heat evolved when 22.4 L of CH_(4) kept under normal conditions, is oxidized into its gaseous products

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.