Chemistry questions
29404 published questions with worked solutions.
- A spontaneous process is defined as a process which
- 1 mole of ice is converted to liquid at 273 k ; H_2O(s) and H_2O(l) have entropies 38.20 and 60.03 J ,mol^ -1 ,deg^ -1 . Entropy...
- A system changes from state A to state B along two different paths I and II. The heat absorbed and work done by the system along...
- For 2A(g) A_2(g) H and S are :
- H_2(g) + Cl_2(g) 2HCl(g) ; H = -44 kcal 2Na(s) + 2HCl(g) 2NaCl(s) + H_2(g) ; H = -152 kcal 2Na(s) + Cl_2(g) 2NaCl(s) , H = ?
- Entropy of a system
- The possibility of a reaction for its completion increases if
- Most disordered system is
- According to the 3rd law of thermodynamics, the entropy at 0 K is zero for
- Which of the following reaction I said to be enthalpy driven?
- The occurrence of reaction is impossible if
- The total entropy change of a system and its surrounding is positive for
- A (G_1 free energy) B (G_2 free energy). The above reaction will be spontaneous only when
- Calculate the energy change for the following reaction at 300 K 2CuO(s) Cu_2O(s) + 1 2 O_2(g) Given : H = 145.6 kJ ,mol^ -1 and S...
- According to Hess's law :
- If C (dia.) + O_2(g) CO_2(g) ; H = -395 kJ If C (gra.) + O_2(g) CO_2(g) ; H = -393 kJ The change in enthalpy when diamond is...
- Given : C(s) + 2S(s) CS_2(l) ; H = 117 kJ C(s) + O_2(g) CO_2(g) ; H = -393 kJ S(s) + O_2(g) SO_2(g) ; H = -297 kJ The heat of...
- One mole of a perfect gas expands to ten times its original volume. The change in entropy is
- One mole of a perfect gas expands isothermally to ten times its original volume. The change in entropy is
- Consider the following reaction occurring in an automobile 2C_8H_ 18 (g) + 25O_2(g) 16CO_2(g) + 18H_2O(g) . The sign of H, S and...