Chemistry questions
29404 published questions with worked solutions.
- If for a reaction H is negative and S is positive then the reaction is
- Given that the reaction, C_2H_ 4(g) + 3O_ 2(g) 2CO_ 2(g) + 2H_2O_ (l) At 298 K, H = -145 kJ if R = 0.0084 kJ. U is equal to
- The H for combustion of a substance
- Given the reaction, N_ 2(g) + 3H_ 2(g) 2NH_ 3(g) , H = -92.6 kJ. The enthalpy of formation of NH_3 is
- Using the following thermochemical data : C_ (s) + O_ 2(g) CO_ 2(g) , H = -94.0 kcal H_ 2(g) + 12 O_ 2(g) H_2O_ (l) , H = -68.0...
- A system, which can exchange mass as well as energy with its surroundings is called as
- In a chemical reaction work is done by the system when
- The enthalpies of combustion of carbon and carbon monoxide are -390 kJ and -278 kJ respectively. The enthalpy formation of carbon...
- If X kJ is the heat produced by the neutralisation of 1 L of The heat produced by neutralising 1 L of 1 M HCl is Y the
- The value of H for the combustion of C_ (s) is -94.0 kcal. Find the value of formation of CO_2 (g).
- Which of the following conditions guarantee that a reaction is spontaneous at constant T and P?
- The value of bond energies ( kJ ,mol^ -1 ) of N - N, N = N, N N are respectively :
- For the combustion of 1 mole of n-octane C_8H_ 18(l) producing carbon dioxide and water vapour at 25^
- A gas does 0.320 kJ of work on its surroundings and absorbs 120 J of heat from surroundings. Hence, U is
- In a reaction, if the heat content of product is more than that of reactant, the reaction is
- Heat of formation of H_2O_ (g) at 25^ is -243 kJ. U for the reaction H_ 2(g) + 12 O_ 2(g) H_2O_ (g) at 25^ is
- Molar Heat capacity is
- The heat evolved in the following reaction 2H_2(g) + O_2(g) 2H_2O(l) , H = -484 kJ to produce 9 g of water is
- The heat change in a chemical reaction at constant pressure is given by
- In the reaction, H_ 2(g) + Cl_ 2(g) 2HCl_ (g) , H = -184 kJ, if 2 moles of H_2 react with 2 moles of Cl_2 , then U is equal to