a) Is the following reaction spontaneous at standard reaction
conditions?
b) At what temperature (oC) does the reaction become
spontaneous?
CaCO3(s) --> CaO(s) + CO2(g)
Determine ΔH°rxn at 25 °C for the reaction
2 HCN(g) → 2 C(graphite) + H2(g) +
N2(g)
given that the standard heat of formation (ΔH°f) of
HCN(g) is 135.1 kJ/mol
What is the condition for a reaction to be spontaneous? If a
reaction is spontaneous at one temperature is it spontaneous under
all conditions? [10 marks] ii) Given the following information
?fH°(CH3OH(g)) = -201.0 kJ mol-1 / S°(CH3OH(g)) = 239.70 J mol-1
K-1 ?fH°(CH2O(g)) = -108.6 kJ mol-1 / S°(CH2O(g)) = 218.95 J mol-1
K-1 ?fH°(H2(g)) = 0 / S°(H2(g)) = 130.70 J mol-1 K-1 determine
?rH°, ?rS° and ?rG° for the formation of formaldehyde from the
dehydrogenation of methanol...
2. Which of the following pairs of reactants will result in a
spontaneous reaction at 25°C. (select all that are spontaneous)
Pb2+(aq) + 2e- → Pb (s) Eºcell=
-0.13V
Cu+(aq) + e- → Cu (s)
Eºcell= +0.52
Ag+(aq)+ e- → Ag
(s) Eºcell= +0.80
Br2 (l)+ 2e- → 2 Br- (aq) Eºcell=
+1.09
Li+(aq) + e- → Li
(s) Eºcell=
-3.04
Al 3+(aq)+ 3e- → Al (s)
Eºcell= -1.66
Fe3+(aq) + 3e- → Fe (s) Eºcell=
-0.036
Ni2+(aq) + 2e-...
At what temperature does the following reaction become
spontaneous? You may assum that the delta H0 and delta
S0 are temperature independent.
2NO(g) + 2H2(g) ---> N2(g) +
2H2O(g)
The following reaction was carried out in a 4.00 L reaction
vessel at 1100 K:
C(s)+H2O(g)⇌CO(g)+H2(g)
If during the course of the reaction, the vessel is found to
contain 5.00 mol of C, 14.8 mol of H2O, 3.30 mol of CO, and 8.60
mol of H2, what is the reaction quotient Q?
Enter the reaction quotient numerically.