| Sections | |||
|---|---|---|---|
| Internal Energy | 22 mins | 0 completed | Learn |
| Calorimetry | 39 mins | 0 completed | Learn |
| Thermochemical Equation | 6 mins | 0 completed | Learn Summary |
| Hess's Law | 17 mins | 0 completed | Learn |
| Enthalpy of Formation | 13 mins | 0 completed | Learn Summary |
| End of Chapter 6 Problems | 52 mins | 0 completed | Learn |
| Additional Practice |
|---|
| Units of Energy |
| Additional Guides |
|---|
| Endothermic & Exothermic Reactions |
| Enthalpy |
Solution: Given the following data:Calculate ΔH for the reaction On the basis of the enthalpy change, is this a useful reaction for the synthesis of ammonia?
Solution: Given the following data:Calculate ΔH for the reaction On the basis of the enthalpy change, is this a useful reaction for the synthesis of ammonia?
Problem
Given the following data:
Calculate ΔH for the reaction 
On the basis of the enthalpy change, is this a useful reaction for the synthesis of ammonia?
Solution
We start solving this by setting up the equations according to the structures drawn
(1) 2NH3 (g) → N2 (g) + 3H2 (g) ΔH°rxn = 92 kJ
(2) 2H2 (g) + O2 (g) → 2H2O (l) ΔH°rxn = -484 kJ
To find the ΔHrxn of the third reaction, we need to use the Hess's Law where we have to rearrange the given equations to get the desired reaction.
Practice Problems
Calculate the enthalpy of the following reaction:
Using Hess’s Law, determine the ΔH of the followin...
Use the standard reaction enthalpies given below t...
Given the chemical reactions:
2 NO2(g) → N2(g) + ...
The values for the enthalpy of reaction are given ...
Given these values of ΔH° :
CS2 (l) + 3O2(g) → CO...
Given the following reactions
Fe2O3 (s) + 3CO (s)...
Given the following reactions
N2 (g) + 2O2 (g) → ...
Calculate ΔH° (in kJ) for the reaction.
2S (s) + ...
S(s) + O2(g) → SO2 (g) ∆H = ‐296.8 kJ
2SO2 +...
The United States gets 95% of its hydrogen gas by ...
Researchers at Purdue University have exploited th...
Given the following data:
3CO2(g) + 4H2O(l) ⇌ C3H...
Use the following equations
C (s) + O2 (g) → CO2 ...
Determine the answer for the question below.
Enthalpy diagram illustrating Hesss law. The ne...
The heat of solution is LiCl is –37.1 kJ/mol, and ...
Consider the following set of reactions:CO + 1/2O2...
Calculate the enthalpy of the reaction4B(s) + 3O2(...
Using the enthalpy of reaction for the 2 reactions...
Consider these reactions, where M represents a gen...
Calculate ΔHrxn for the following reaction: Expres...
Consider these reactions, where M represents a gen...
Using Hess' Law, calculate the enthalpy of formati...
Which of the following is a statement of Hess's la...
H2(g) + F2(g) → 2HF (g) ΔH rxn = -546.6 ...
Calculate the enthalpy of the reaction2NO(g) + O2(...
Given the following data2 O3 (g) → 3 O2 (g) ...
Calculate the enthalpy of the reaction4B(s) + 3O2(...
Calculate ΔH°rxn for the reaction
2 Ni(s) + 2 S(s...
Coal gasification can be represented by the equati...
Calculate ΔH for the reaction C4H4(g) + 2H2(g) → C...
At 1 atm pressure, the heat of sublimation of gall...
Calculate the enthalpy change for the reactionP4O6...
Now consider the following set of reactions:2NO2 →...
From the enthalpies of reaction2 H2(g) + O2(g) → 2...
From the enthalpies of reactionH2 (g) + F2 (g) → 2...
Given the dataN2 (g) + O2 (g) → 2 NO (g) ...
Diamond and graphite are two crystalline forms of ...
Consider the following generic reaction:
A+2B→C+3...
Calculate the ΔHrnx for the following reaction CH4...
Consider the following set of reactions:
N2 + 2O2...
Given these reactions:
X(s) +1/2 O2(g) → XO(s)
H...
Now consider the following set of reactions:
Reac...
Calculate ΔHrxn for the following reaction
2 NOCl...
Calculate the ΔHrnx for the following reaction C(s...
Even though so much energy is required to form a m...
Find ΔHrxn for the following reaction: N2O(g) + NO...
Calculate ΔH for the process Hg 2Cl2(s) ⟶ 2Hg(l) +...
Calculate ΔH°298 for the process Co3O4(s) ⟶ 3Co(s)...
Calculate the standard molar enthalpy of formation...
Calculate ΔH°298 for the process Sb(s) + 5/2Cl2(g)...
Calculate ΔH°298 for the process Zn(s) + S(s) + 2O...
Given the following dataFe2O3 (s) + 3 CO (g) → 2 F...
For each generic reaction, determine the value of ...
For each generic reaction, determine the value of ...
For each generic reaction, determine the value of ...
Calculate ΔHrxn for the following reaction: Fe2O3(...
Calculate ΔHrxn for the following reaction: 5 C(s)...
Consider the combustion of liquid methanol, CH3OH(...
The chemistry of nitrogen oxides is very versatile...
Given the following data:2ClF (g) + O2 (g) → Cl2O ...
Calculate ΔH for the reaction2NH3 (g) + 1/2 O2 (g)...
Calculate ΔH for the reaction N2H4 (l) + O2 (g) → ...
Given the following dataP4 (s) + 6Cl2 (g) → 4PCl3 ...
Calculate the enthalpy change for the reaction: P4...
Calculate ΔH forCa (s) + 1/2O2 (g) + CO2 (g) ⟶ CaC...
Calculate ΔH for2NOCl (g) ⟶ N2 (g) + O2 (g) + Cl2 ...
Write the balanced overall equation (equation 3) f...
Write the balanced overall equation (equation 3) f...
At a given set of conditions, 241.8 kJ of heat is ...
Consider the following generic reaction: A + 2B → ...
Consider the following generic reaction: A + 2B → ...
When 1 mol of CS2(l) forms from its elements at 1 ...
Calculate ΔHrxn for the following reaction: CaO(s)...
Calculate ΔHrxn Delta H_{
m rxn} for the followin...
The ΔHf˚ of TiI3(s) is –328 kJ/mol and the ΔH˚ for...
Consider the following balanced thermochemical equ...Given the following thermochemical data:Fe2O3(s) +...From the enthalpies of reaction2 C(s) + O2(g) → 2C...Given the following thermochemical data: ...(i) Consider this reactionC2H5OH + 3O2 → 2CO2 + 3H...Given:1. A → 2B, ΔH1 2. B → C + D, ΔH2 3. E → 2D, ...Calculate the ΔH (in kJ) for the reaction:3 Fe2O3 ...Given the following reactionsH2O (l) →H2O (g) ...From the enthalpies of reaction2C(s) + O2 (g) → 2C...
Consider these reactions, where M represents a gen...
Given the following dataCa(s) + 2C (graphite) → Ca...
Using the following data, calculate the standard h...
The following sequence of reactions occurs in the ...
Calculate ΔHrxn for the reaction CaO(s) + CO2(g) →...
Use the standard reaction enthalpies given below t...
Reaction of gaseous ClF with F 2 yields liquid ClF...
A chemist measures the enthalpy change ΔH during t...
Given the following data:Calculate ΔH for the reac...Calculate the enthalpy change of2A + E -->3Cgiv...Use the standard reaction enthalpies given below t...
Given the following reactions:(1) 2NO --> N2 + ...
Consider these reactions, where M represents a gen...
Calculate the enthalpy of formation of SO2 (g) fro...A chemist measures the enthalpy change ΔH during t...Use the following data to determine the Delta H fo...Consider the equations below. (1) Ca (s) + CO2 (g)...Given these reactions, X (s) + 1/2O2 (g) → XO (s) ...How can the first two reactions be combined to obt...
Calculate Δ Hrxn for the following reaction:CaO(s)...Nitroglycerine is a powerful explosive that forms ...Calculate the enthalpy of the reaction 4B (s) + 3O...Given the standard enthalpy changes for the follow...A chemist measures the enthalpy change ΔH during t...Research is being carried out on cellulose as a so...
Find ΔH° for BaCO3 (s) → BaO (s) + CO2 (g) given t...Enter your answer in the provided box.From these d...
From the enthalpies of reaction 2C(s) + O2(g) → 2C...Calculate the ΔH° for the following reaction using...Using data from the following reactions and applyi...Given the following reactions: 2S (s) + 3O2 (g) → ...
Given that H2 (g) + F2 (g) → 2HF (g) ΔH°rxn = ...Calculate the enthalpy of the reaction 2NO (g) + O...The industrial process for making sulfuric acid ha...Calculate ΔH°rxn for the reaction 2Ni (s) + 2S (s)...
The combustion reaction of butane is as follows. C...
Given the following data: N2(g) + O2(g) → 2NO(g), ...Enter your answer in the provided box.You are give...Given the following data (1) 2ClF (g) + O2 (g) → C...Consider the following chemical reaction. NH3(g) +...Consider the following hypothetical reactions:A → ...The enthalpy of decomposition of NO2Cl is -114 kJ....
Use the following data to calculate the standard h...
Calculate ΔHrxn for the following reaction:CH4(g) ...