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)).`

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.

Delta H_("combustion") of C _(6) H _(6) (l) . C(s) and H _(2) (g) are - 3000 kJ ,-390KJ mol^(-1) and - 290 kJ mol ^(-1) respectively. Hence heat of formation of benzene, is

The enthalpies of combustion of S, SO_(2) and H_(2) are -298.2, -98.7 and -287.3.kJ mol^(-1) respectively. If enthalpy of the reaction SO _(x (g)) + H _(2) O _((f)) to H _(2 ) SO _(4 (f)) is - 130.2 kJ mol ^(-1), the enthalpy of formation of H_(2)SO_(4) is

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

The enthalpy of formation of CO(g), CO_2(g) , N_2O(g), N_2O_4(g) are -110, -393, 81 and 9.7 kJ mol^-1 respectively. N_2O_4 +3CO(g) -> N_2 O(g)+3 CO_2 (g). Find the value of Delta rH for the reaction: