Advertisements
Advertisements
प्रश्न
Calculate the enthalpy change for the reaction \[\ce{Fe2O3 + 3CO -> 2Fe + 3CO2}\] from the following data.
\[\ce{2Fe + 3/2O2 -> Fe2O3}\]; ΔH = −741 kJ
\[\ce{C + 1/2O2 -> CO}\]; ΔH = −137 kJ
\[\ce{C + O2-> CO2}\]; ΔH = −394.5 kJ
Advertisements
उत्तर
∆Hf (Fe2O3) = −741 kJ mol−1
∆Hf (CO) = −137 kJ mol−1
∆Hf (CO2) = −394.5 kJ mol−1
\[\ce{Fe2O3 + 3CO -> 2Fe + 3CO2}\]
ΔHr = ?
ΔHr = `Σ (Δ"H"_"f")_"products" − Σ (Δ"H"_"f")_"reactants"`
ΔHr = [2 ∆Hf (Fe) + 3 ∆Hf (CO2)] – [∆Hf (Fe2O3) + 3∆Hf (CO)]
ΔHr = [0 + 3 (−394.5)] − [−741 + 3 (−137)]
ΔHr = [−1183.5] − [−1152]
ΔHr = −1183.5 + 1152
ΔHr = −31.5 kJ mol−1
APPEARS IN
संबंधित प्रश्न
Select the most appropriate option.
The enthalpy of formation for all elements in their standard states is _______.
Answer the following question.
When 6.0 g of O2 reacts with CIF as per
\[\ce{2ClF_{(g)} + O2_{(g)} -> Cl2O_{(g)} + OF2_{(g)}}\]
The enthalpy change is 38.55 kJ. What is the standard enthalpy of the reaction? (Δr H° = 205.6 kJ)
Write the expression showing the relation between enthalpy change and internal energy change for gaseous phase reaction.
Enthalpy of neutralization is always a constant when a strong acid is neutralized by a strong base: account for the statement.
When 6.0 g of O2 reacts with CIF as per \[\ce{2ClF_{(g)} + O2_{(g)} -> Cl2O_{(g)} + OF2_{(g)}}\] the enthalpy change is 38.55 kJ. The standard enthalpy of the reaction is ____________.
Identify the equation in which change in enthalpy is equal to change in internal energy.
The enthalpy change for two reactions are given by the equations
\[\ce{2Cr_{(s)} + 1.5 O2_{(g)} -> Cr2O3_{(s)}}\];
∆H1 = −1130 kJ ............(i)
\[\ce{C_{(s)} + 0.5 O2_{(g)} -> CO_{(g)}}\];
∆H2 = −110 kJ .........(ii)
What is the enthalpy change, in kJ, for the following reaction?
\[\ce{3C_{(s)} + Cr2O3_{(s)} -> 2Cr_{(s)} + 3CO_{(g)}}\]
In which of the following reactions, ΔH is not equal to ΔU?
Calculate ΔS of the surrounding if the standard enthalpy of formation of methanol is − 238.9 kJ mol−1.
Calculate the standard entropy change of the surrounding if standard enthalpy of formation of methyl alcohol is –240 kJ mol-1.
