The combustion of ethene, C2H2, is given by the equation C2H4 + 2H2O;&#916;H = -1428kJ. If the molar heats of formation of water and carbon (VI) oxide are -286kJ and -396kJ respectively, calculate the molar heat of formation of ethene in kJ

In the above experiment (Fig 2.) , a current was passed for 10 minutes and 0.63g of copper was to be deposited on the cathode of CuSO4 cells. The weight of silver deposited on the cathode of AgNO3 cell during the same period would be (Cu = 63, Ag = 108)

The following reactions are stages in important industrial processes:
I. N2(g) + 3H2(g) &#8596; 2NH3(g) &#916;H is negative
II. 2SO2(g) + O2(g) &#916;H is negative
III. N2(g) + O2 &#8596; 2SO3(g) &#916;H is positive
Which of the above forward reactions is favoured by (I) a decrease in the concentration of the pressure and (II) an increase in temperature?