Chemistry questions
29404 published questions with worked solutions.
- Enthalpy change for the reaction, 4H(g) 2H_2(g) is -869.5 kJ. The dissociation energy of H - H bonds is
- The heat energy required to ionise the following molecules is given as follows N_2(g) H_1 N_2^ + (g) , O_2(g) H_2 O_2^ + (g)...
- Given that H_1(H) = 218 kJ/mol, express the H - H bond energy in kcal/mol
- The sublimation energy of I_2(s) is 57.3 kJ/mol and the enthalpy of fusion is 15.5 kJ/mol. The enthalpy of vaporisation of I_2 is
- The enthalpy of reaction, H_2(g) + 1 2 O_2(g) H_2O(g) is H_1 and that of H_2(g) + 1 2 O_2(g) H_2O(l) is H_2. Then
- The heat of neutralisation is highest for the reaction between
- The H - H bond energy is 430 kJ mol^ -1 and Cl - Cl bond energy is 240 kJ mol^ -1 , H for HCl is -90 kJ. The H - Cl bond energy...
- Heat of formation of SO_2 is -298 kJ. What is the heat of combustion of 4 g of S ?
- The quantity of heat measured for a reaction in a bomb calorimeter is equal to
- Heat capacity (C_p) is an extensive property but specific heat (C) is an intensive property. What will be the relation between...
- The heat of neutralisation of a strong acid and a strong alkali is 57.0 kJ mol^ -1 . The heat released when 0.5 mole of HNO_3...
- A cylinder of gas is assumed to contain 11.2 kg of butane ( C_4H_ 10 ). If a normal family needs 20000 kJ of energy per day, the...
- Calculate the enthalpy change on freezing of 1.0 mole of water at 10.0^ to ice at -10.0^ . [ _ fus H = 6.03 kJ mol^ -1 at 0^ .]...
- If 900 J/g of heat is exchanged at boiling point of water then increase in entropy is
- The heat of atomisation of methane and ethane are 360 kJ/mol and 620 kJ/mol, respectively. The longest wavelength of light...
- Energies required to break the individual C-H bonds in each successive step differ CH_4(g) CH_3(g) + H(g); _ bond H^ = 427 kJ...
- Use the given data to calculate the resonance energy of N_2O . ( _fH^ of N_2O = 82 kJ mol^ -1 ) Bond energy of N = O 607 kJ mol^...
- A reaction takes place in a several sequential steps A, B, C and D. The value of enthalpy change for sequential steps are p, q, r...
- The ....(i).... of a system can be changed by transfer of heat from the surrounding to the system or vice-versa without...
- The heat of reaction for C_ 10 H_8(s) + 12O_2(g) 10CO_2(g) + 4H_2O(l) at constant volume is -1228.2 kcal at 25^ . The heat of...