What is the enthalpy change for the reaction, W (s) + 3 H2O (g) --> WO3...

What is the enthalpy change for the reaction, W (s) + 3 H2O (g) --> WO3 (s) + 3 H2 (g) ? Given: 2 W (s) + 3 O2 (g) --> 2 WO3 (s) ΔH = – 1685.4 kJ H2 (g) + ½ O2 (g) --> H2O (g) ΔH = – 241.82 kJ

Expert Solution

The given reactions are as below:

2 W (s) + 3 O₂ (g) -------> 2 WO₃ (s); ΔH = -1685.4 kJ…….(1)

H₂ (g) + ½ O₂ (g) -------> H₂O (g); ΔH = -241.8 kJ…….(2)

Divide (1) by 2 to get one unit, each of W and WO₃. This will half the value of ΔH(1). Multiply (2) by 3 and subtract from the result above. This will increase the value of ΔH(2) by 3. Therefore, we have,

W (s) + 3/2 O₂ (g) – 3 H₂ (g) – 3/2 O₂ (g) ------> WO₃ (s) – 3 H₂O (g)

Subtract common terms and get

W (s) + 3 H₂O (g) ------> WO₃ (s) + 3 H₂ (g)

The above is our given reaction. The enthalpy change is given as

ΔH = ½*ΔH(1) – 3*ΔH(2) = ½*(-1685.4 kJ) – 3*(-241.8 kJ) = -842.7 kJ + 725.4 kJ = -117.3 kJ (ans).

queen_honey_blossom answered 2 years ago

The enthalpy change is -400 kJ for reaction: 2 Al(s)+ 3/2 O2(g) ? Al2O3(s). What is...

The enthalpy change is -400 kJ for reaction: 2 Al(s)+ 3/2 O2(g) ? Al2O3(s). What is the ?H for the following reaction? 2 Al2O3(s) ? 4Al(s) + O2(g) is

1. Determine the enthalpy for this reaction: 2NaOH(s)+CO2(g) Na2CO3(s)+H2O(l) 2. Consider the reaction Na2CO3(s)Na2O(s)+CO2(g) with enthalpy...

1. Determine the enthalpy for this reaction: 2NaOH(s)+CO2(g) Na2CO3(s)+H2O(l) 2. Consider the reaction Na2CO3(s)Na2O(s)+CO2(g) with enthalpy of reaction Hrxn=321.5kJ/mol What is the enthalpy of formation of Na2O(s)? Express your answer in kilojoules per mole to one decimal place.

Calculate the enthalpy change for the reaction: 4 Fe(s) + 3 O2(g) → 2 Fe2O3(s) ...

Calculate the enthalpy change for the reaction: 4 Fe(s) + 3 O2(g) → 2 Fe2O3(s) ΔH°rxn = ? where: 2 Fe(s) + 6 H2O(ℓ) → 2 Fe(OH)3(s) + 3 H2(g) ΔH1° = +321.8 kJ 2 H2O(ℓ) → 2 H2(g) + O2(g) ΔH2° = +571.7 kJ Fe2O3(s) + 3 H2O(ℓ) → 2 Fe(OH)3(s) ΔH3° = +288.6 kJ

Calculate the standard enthalpy change for the following reaction at 25 °C. H2O(g)+C(graphite)(s) ----> H2(g)+CO(g) deltaH...

Calculate the standard enthalpy change for the following reaction at 25 °C. H2O(g)+C(graphite)(s) ----> H2(g)+CO(g) deltaH rxn=_____kJ

1) Calculate the enthalpy of reaction (ΔHrxn) for the following reaction: Fe2O3(s) + 3 CO(g) →...

1) Calculate the enthalpy of reaction (ΔHrxn) for the following reaction: Fe2O3(s) + 3 CO(g) → 2 Fe(s) + 3 CO2(g) Given: 4 Fe(s) + 3 O2(g) → 2 Fe2O3(s) ΔH = –1648 kJ 2 CO2(g) → 2 CO(g) + O2(g) ΔH = +565.4 kJ 2) Use standard enthalpies of formation to calculate the standard enthalpy of reaction for the following reaction: 2 H2S(g) + 3 O2(g) → 2 H2O(l) + 2 SO2(g) ΔH∘rxn

Consider the reaction 2KHSO3(s) ⇌ K2SO3(s) + H2O(g) + SO2(g) at equilibrium. What happens to the...

Consider the reaction 2KHSO3(s) ⇌ K2SO3(s) + H2O(g) + SO2(g) at equilibrium. What happens to the partial pressure of H2O(g) if the volume of the reaction flask is doubled? (increases, decreases, nothing)

Calculate the standard enthalpy change for the following reaction at 25 degrees C. HCl(g) + NaOH(s)...

Calculate the standard enthalpy change for the following reaction at 25 degrees C. HCl(g) + NaOH(s) ---> NaCl(s) + H2O(l)

The standard enthalpy change of combustion [to CO2(g) and H2O()] at 25°C of the organic solid...

The standard enthalpy change of combustion [to CO2(g) and H2O()] at 25°C of the organic solid 1,2-benzenediol, C6H6O2(s), is determined to be -2874.7 kJ mol-1. What is the Hf° of C6H6O2(s) based on this value? Use the following data: Hf° H2O () = -285.83 kJ mol-1 ; Hf° CO2(g) = -393.51 kJ mol-1 ______ kJ mol-1

1/ a/ Calculate the change in enthalpy of the reaction below using Hess's law. S (s)...

1/ a/ Calculate the change in enthalpy of the reaction below using Hess's law. S (s) + O2 (g) → SO2 (g) (1) 2 SO2 (g) + O2 (g) → 2 SO3 (g) ΔH = - 196 kJ (2) 2 S (s) + 3 O2 (g) → 2 SO3 (g) ΔH = - 790 kJ b/ Calculate the change in enthalpy of the reaction below using Hess's law. N2O4 (g) → 2NO2 (1) 2NO2 (g) → 2NO (g) + O2...

1. For which system is ∆S<0? H2O(l)→H2O(g) H2O(g)→H2O(s) H2O(s)→H2O(l) H2O(s)→H2O(g) 2. Which pure substance under standard...

1. For which system is ∆S<0? H2O(l)→H2O(g) H2O(g)→H2O(s) H2O(s)→H2O(l) H2O(s)→H2O(g) 2. Which pure substance under standard conditions would have the highest entropy? O2 HCl CH3OH S

Question