Question

Question 9 For which of these reactions will the difference between AH° and AEº be the greatest? NO(g) + O3(g) —+NO2(g) + O2(g) 4NH3(g) + 5O2(g) + 4NO(g) + 6H2O(g) 2C2H6(g) + 702(g) + 4CO2(g) + 6H20(1) 2H2O2(1) +2H2O(1) + O2(g) 0 CaCO3(s) CaO(s) +CO2(8)

Answer 1

$\Delta$ H = $\Delta$ E + $\Delta$ nRT

$\Delta$H - $\Delta$ E   = $\Delta$ nRT

$\Delta$n = no of moles of products in gases - no of moles of reactants in gases

NO(g) + O3(g) ------------> NO2(g) + O2(g)

$\Delta$n = (1+1) -(1+1) = 0

$\Delta$H - $\Delta$ E   = 0

4NH3(g) + 5O2(g) ---------> 4NO(g) + 6H2O(g)

$\Delta$n    = (4+6) -(4+5) = 1

$\Delta$H - $\Delta$ E   = 1RT

2C2H6(g) + 7O2(g) --------> 4CO2(g) + 6H2O(l)

$\Delta$n   = 4-(2+7)   = -5

$\Delta$H - $\Delta$ E   = -5RT

2H2O2(l) ------> 2H2O(l) + O2(g)

$\Delta$n = 1

$\Delta$H - $\Delta$ E   = 1RT

CaCO3(s) -----------> CaO(s) + CO2(g)

$\Delta$n   = 1

$\Delta$H - $\Delta$ E   = 1RT

2C2H6(g) + 7O2(g) --------> 4CO2(g) + 6H2O(l) >>>answer