List of top Chemistry Questions on Enthalpy change asked in KEAM

Enthalpy of combustion of benzene, graphite, dihydrogen are \( -3260 \), \( -390 \) and \( -290\text{ kJ/mol} \). Find the enthalpy of formation of benzene

12g of pure graphite is burnt. Temperature rises from 298 K to 308 K. Heat capacity of the calorimeter is $20.7~kJ~K^{-1}$. Enthalpy change for combustion of 1 mole of graphite $(kJ~mol^{-1})$ is ________.

The standard enthalpy of formation of CH₄(g), CO₂(g) and H₂O(I) are -75 kJ mol^-1, -393 kJ mol^-1 and -286 kJ mol^-1 respectively. The amount of heat liberated (in kJ) when 3.2g of methane gas is burnt under standard conditions is

The enthalpy change for the evaporation of a liquid at its boiling point 127°C is +40.32 $kJmol^{-1}$. What is the value of internal energy change for the above process at 127°C? (R=8.3 $JK^{-1}mol^{-1}$)

Enthalpy change is always negative for which one of the following processes?

The first ionisation enthalpy is the least in

The standard heat of formation of $CH_4, CO_2$ and $H_2O (I)$ are $ -76.2, -394.8$ and $-285.82\, kJ\, mol^{-1}$, respectively. Heat of vaporization of water is $44\, kJ\, mol^{-1}$. Calculate the amount of heat eveolved when $22.4\, L$ of $CH _4$, kept under normal conditions, is oxidized into its gaseous products

The value of ($\Delta H - \Delta E$) for the reaction $C_6H_6(1) + 7\frac{1}{2} O_2(g) \rightarrow 6CO_2(g) + 3H_2O(I)$ at 270C is (R = 2 cal K-1 mol-1)

One mole of solid iron was vaporized in an oven at its boiling point of 3443 K and enthalpy of vaporization of iron is 344.3 kJ mol$^{-1}$. The value of entropy vaporization (in J mol$^{-1}$) of iron is

The values if ?H and ?S for the reaction C(graphite) + CO(g) ?2CO(g) Are 170 kJ and 170 JK-1 respectively. The reaction will be spontaneous only a

The value of ($\Delta H - \Delta E$) for the reaction $C_6H_6(1) + 7\frac{1}{2} O_2(g) \rightarrow 6CO_2(g) + 3H_2O(I)$ at 270C is (R = 2 cal K-1 mol-1)