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Formation Equations Solutions Library

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Formation Equations

Q. For which one of the following reactions is the value of ΔHrxn equal to ΔHf° for the productA) 2 H2 (g) + O2 (g) → 2 H2O (g)B) C (s, graphite) + 2 ...

Solved • Oct 23, 2020

Formation Equations

Q. Part A. For which of the following reactions is ΔH°rxn equal to ΔH°f of the product(s)? You do not need to look up any values to answer this questi...

Solved • Jul 2, 2020

Formation Equations

Q. What is the balanced chemical equation for the reaction used to calculate ΔH°f of BaCO3(s)?If fractional coefficients are required, enter them as a...

Solved • Jul 2, 2020

Formation Equations

Q. If the heat of formation of H2O(l) is -286 kJ/mol, which of the following thermochemical equations for the formation of H2O is correct?  a) H2 (g) ...

Solved • Jun 30, 2020

Formation Equations

Q. Write the chemical equation for the reaction whose enthalpy change is the standard enthalpy of formation of sucrose (table sugar (C12H22O11)Express...

Solved • Jun 30, 2020

Formation Equations

Q. What is the value of the standard enthalpy of formation of an element in its most stable form?

Solved • Jun 30, 2020

Formation Equations

Q. Find  ΔH°f for C2H5OH(l) from the given table.Express your answer using one decimal place.

Solved • Jun 25, 2020

Formation Equations

Q. Enter an equation for the formation of C2H5OH(l) from its elements in their standard states. Enter any reference to carbon as C(s).Express your ans...

Solved • Jun 25, 2020

Formation Equations

Q. Find ΔH°f for C2H4(g) from the given table.Express your answer using one decimal place.

Solved • Jun 25, 2020

Formation Equations

Q. Enter an equation for the formation of C2H4(g) from its elements in their standard states. Enter any reference to carbon as C(s).  Express your ans...

Solved • Jun 25, 2020

Formation Equations

Q. Enter an equation for the formation of MgCO3(s) from its elements in their standard states. Enter any reference to carbon as {\rm C}({\rm s}).Expre...

Solved • Jun 25, 2020

Formation Equations

Q. Find ΔH°f for BF3(g) from the given table.SubstanceΔH°f kJ/molB(g)565.0B(s)0F(g)79.38F2(g)0BF3(g)-1136.0BCl3(g)-403.8B­2H6(g)36.4B2O3(g)-1273.5Expr...

Solved • Jun 25, 2020

Formation Equations

Q. Enter an equation for the formation of BF3  from its elements in their standard states.Express your answer as a chemical equation. Identify all of ...

Solved • Jun 25, 2020

Formation Equations

Q. Identify a substance that is NOT in its standard state. a. HCl(s) b. N2(g) c. Rn(g) d. F2(g) e. Li(s)

Solved • Jun 15, 2020

Formation Equations

Q. Write an equation for the formation of FeCl3(s) from its elements in their standard states. Express your answer as a chemical equation. Identify al...

Solved • Apr 30, 2020

Formation Equations

Q. Write an equation for the formation of MgO(s) from its elements in their standard states. Express your answer as a chemical equation. Identify all ...

Solved • Apr 30, 2020

Formation Equations

Q. Write an equation for the formation of HCl(g) from its elements in their standard states. Express your answer as a chemical equation. Identify all ...

Solved • Apr 30, 2020

Formation Equations

Q. Which of the following substances have a standard heat of formation (ΔHf°) of zero? Cl2(g) at 2 atm ,C2H6(g) at standard conditions ,O2(g) at 25.0 ...

Solved • Apr 27, 2020

Formation Equations

Q. For each of the following reactions, identify another quantity that is equal to Δ°Hrxn. 1. CH4(g) + 2O2(g) →CO2(g) + 2H2O(l) a) enathalpy of combus...

Solved • Mar 25, 2020

Formation Equations

Q. For the reaction,2H2 (g) + O2 (g) → 2H2O(g) ΔH = -484 kJwhich of the following is true?(a) The ΔHf° for H2O(g) is -484 kJ/mole.(b) All reactants an...

Solved • Oct 18, 2019

Formation Equations

Q. For which of the following reactions is the value of ∆H°rxn equal to ∆H°f for the product?I. N2(g) + O3(g) ⟶ N2O3(g)II. 2 Ca(s) + O2(g) ⟶ 2 CaO(s)I...

Solved • Oct 3, 2019

Formation Equations

Q. For which one of the following equations is ΔH°rxn equal to ΔHf° for the product?A) Xe(g) + 2F2(g) → XeF4 (g)B) CH4(g) + 2Cl2(g) → CH2Cl2(l) + 2HCl...

Solved • Sep 24, 2019

Formation Equations

Q. For which of the following reactions is ΔH°rxn equal to ΔH°f of the product(s)?2Na(s) + Cl2(g) → 2NaCl(s)H2(g) + 12O2(g) → H2O(g)Na(s) + 12Cl2(g) →...

Solved • Aug 7, 2019

Formation Equations

Q. Consider the decomposition of liquid hydrogen peroxide (H2O2) to form water and oxygen.What is the heat of formation for gaseous oxygen?

Solved • Nov 12, 2018

Formation Equations

Q. Consider the decomposition of liquid hydrogen peroxide (H2O2) to form water and oxygen. Write the balanced chemical equation that corresponds to th...

Solved • Nov 12, 2018

Formation Equations

Q. Consider the decomposition of liquid hydrogen peroxide (H2O2) to form water and oxygen. Write the balanced chemical equation that corresponds to th...

Solved • Nov 12, 2018

Formation Equations

Q. Consider the decomposition of liquid hydrogen peroxide (H2O2) to form water and oxygen. Write the balanced chemical equation that corresponds to th...

Solved • Nov 12, 2018

Formation Equations

Q. Standard thermodynamic quantities for selected substances at 25 °C SubstanceΔH ( kJ/mol)Na(s)0.0Na(g)107.5Cl(g)121.3Cl2(g)0.0NaCl(s)-411.2Pb(s)0.0P...

Solved • Nov 12, 2018

Formation Equations

Q. Standard thermodynamic quantities for selected substances at 25 °C SubstanceΔH ( kJ/mol)Na(s)0.0Na(g)107.5Cl(g)121.3Cl2(g)0.0NaCl(s)-411.2Pb(s)0.0P...

Solved • Nov 12, 2018

Formation Equations

Q. Standard Enthalpies (or Heats) of Formation, ΔH°f , at 298 KSubstanceΔH°f (kJ/mol)Na(s)0.0Na(g)107.5Cl(g)121.3Cl2(g)0.0NaCl(s)-411.2Pb(s)0.0Pb(g)19...

Solved • Nov 12, 2018

Formation Equations

Q. Write an equation for the formation of Fe2O3 (s) from its elements in their standard states.

Solved • Nov 12, 2018

Formation Equations

Q. Write an equation for the formation of CH4(g) from its elements in their standard states.

Solved • Nov 12, 2018

Formation Equations

Q. Write an equation for the formation of one mole of NO2 (g) from its elements in their standard states.

Solved • Nov 12, 2018

Formation Equations

Q. Write an equation for the formation one mole of MgCO3 (s) from its elements in their standard states. Write any reference to carbon as C(s).

Solved • Nov 12, 2018

Formation Equations

Q. Write an equation for the formation one mole of C2H4 (g) from its elements in their standard states. Write any reference to carbon as C(s).

Solved • Nov 12, 2018

Formation Equations

Q. Write an equation for the formation one mole of CH3OH(l) from its elements in their standard states. Write any reference to carbon as C(s).

Solved • Nov 12, 2018

Formation Equations

Q. Write an equation for the formation of NH3 (g) from its elements in their standard states.

Solved • Nov 12, 2018

Formation Equations

Q. Write an equation for the formation of CO2 (g) from its elements in their standard states.

Solved • Nov 12, 2018

Formation Equations

Q. The standard enthalpy of formation for glucose, C6H12O6(s), is –1273.3 kJ/mol. What is the correct formation equation corresponding to this ΔH˚f?

Solved • Nov 12, 2018

Formation Equations

Q. Methanol (CH3 OH) has been suggested as a fuel to replace gasoline.How does methanol compare to octane with respect to global warming?

Solved • Nov 12, 2018

Formation Equations

Q. What is a standard state?

Solved • Nov 12, 2018

Formation Equations

Q. What is the standard enthalpy of formation for a pure element in its standard state?

Solved • Nov 12, 2018

Formation Equations

Q. What is the value of the standard enthalpy of formation of an element in its most stable form?

Solved • Oct 31, 2018

Formation Equations

Q. Write the chemical equation for the reaction whose enthalpy change is the standard enthalpy of formation of sucrose, C12H22O11(s), HfHf[{ m C_{12}H...

Solved • Oct 31, 2018

Formation Equations

Q. Thermodynamic Quantities for Selected Substances at 298.15 KSubstanceHfo (kJ/mol)NO(g)90.37NO2(g)33.84N2O(g)81.6N2O4(g)9.66SO2(g)-296.9SO3(g)-395.2...

Solved • Oct 31, 2018

Formation Equations

Q. Thermodynamic Quantities for Selected Substances at 298.15 KSubstanceHfo (kJ/mol)NO(g)90.37NO2(g)33.84N2O(g)81.6N2O4(g)9.66SO2(g)-296.9SO3(g)-395.2...

Solved • Oct 31, 2018

Formation Equations

Q. Thermodynamic Quantities for Selected Substances at 298.15 KSubstanceHfo (kJ/mol)NO(g)90.37NO2(g)33.84N2O(g)81.6N2O4(g)9.66SO2(g)-296.9SO3(g)-395.2...

Solved • Oct 31, 2018

Formation Equations

Q. Thermodynamic Quantities for Selected Substances at 298.15 KSubstanceHfo (kJ/mol)NO(g)90.37NO2(g)33.84N2O(g)81.6N2O4(g)9.66SO2(g)-296.9SO3(g)-395.2...

Solved • Oct 31, 2018

Formation Equations

Q. Write a balanced chemical equation depicting the formation of one mole of H2O2(g) from its elements in their standard states.

Solved • Oct 31, 2018

Formation Equations

Q. Write a balanced chemical equation depicting the formation of one mole of CaCO3(s) from its elements in their standard states.

Solved • Oct 31, 2018

Formation Equations

Q. Write a balanced chemical equation depicting the formation of one mole of POCl3(l) from its elements in their standard states.

Solved • Oct 31, 2018

Formation Equations

Q. Write a balanced chemical equation depicting the formation of one mole of C2H5OH(l) from its elements in their standard states.

Solved • Oct 31, 2018

Formation Equations

Q. Ozone, O3(g), is a form of elemental oxygen produced during electrical discharge. Is ΔH˚f(g) for O3(g) necessarily zero?

Solved • Oct 31, 2018

Formation Equations

Q. What is meant by the term standard conditions, with reference to enthalpy changes?

Solved • Oct 31, 2018

Formation Equations

Q. What is meant by the term enthalpy of formation?

Solved • Oct 31, 2018

Formation Equations

Q. What is meant by the term  standard enthalpy of formation?

Solved • Oct 31, 2018

Formation Equations

Q. Write reactions for which the enthalpy change will bec. the standard enthalpy of neutralization of sodium hydroxide solution by hydrochloric acid.

Solved • Oct 18, 2018

Formation Equations

Q. When one mole of gasecus ethanol, C2H5OH, reacts with three moles of gaseous oxygen, two moles of gaseous carbon diaxide and three moles of water v...

Solved • Oct 1, 2018

Formation Equations

Q. Write the formation reaction for sodium perchlorate (NaClO4).

Solved • Mar 27, 2018

Formation Equations

Q. What is the balanced chemical equation for the reaction used to calculate ΔH°f of MgCO3(s)?

Solved • Mar 23, 2018

Formation Equations

Q. What is the balanced chemical equation for the reaction used to calculate the standard enthalpy of formation of SrCO3 (s)?

Solved • Mar 23, 2018

Formation Equations

Q. Choose the reaction that represents ΔH°f for Ca(NO3)2a. Ca2+(aq) + 2NO3-(aq) → Ca(NO3)2(aq)b. Ca(s) + 2N(g) + 6O(g) → Ca(NO3)2(s)c. Ca(NO3)2(aq) → ...

Solved • Mar 16, 2018

Formation Equations

Q.  To which one of the following reactions occurring at 25°C does the symbol ΔH°f of HNO3(l) refer?a. H(g) + N(g) + O3(g) → HNO3(l)b. (1/2)H2(g) + (1...

Solved • Mar 15, 2018

Formation Equations

Q. Which of the following substances have a standard heat of formation (ΔHf°) of zero?a) Cl2(g) at 2 atmb) C2H6 at standard conditionsc) O2(g) at 25.0...

Solved • Feb 22, 2018

Formation Equations

Q. What is the balanced chemical equation for the reaction used to calculate Δ H∘f of CaCO3(s)?If fractional coefficients are required, enter them as ...

Solved • Feb 13, 2018

Formation Equations

Q. For which of the following reactions is ΔH ∘rxn equal to ΔH∘f of the product(s)?You do not need to look up any values to answer this question. Chec...

Solved • Feb 12, 2018

Formation Equations

Q. For which of the following reactions is ΔH°rxn equal to ΔH°f of the product(s)? Select all that apply.H2(g) + 12O2(g) → H2O(g)2Li(s) + Cl2(g) → 2Li...

Solved • Jan 4, 2018

Formation Equations

Q. Which of the following equations represents a reaction that provides the enthalpy of formation of NaClO3? A. NaClO(s) + O2(g) → NaClO3(s) B. NaCl...

Solved • Aug 17, 2017

Formation Equations

Q. The value of ∆H0 for which of the following reactions is referred to as the standard molar enthalpy of formation of carbon monoxide? 1. C(g) + 12 ...

Solved • Jun 21, 2017

Formation Equations

Q. For which one of the following reactions is ΔH°rxn equal to the heat of formation of the product?A) 12C (g) + 11H2 (g) + 11O (g) → C6H22O11 (g)B) N...

Solved • Sep 14, 2016

Formation Equations

Q. For which should the standard heat of formation ΔH°f, be zero at 25°C?A) O3(g)B) O2(g)C) O(g)D) all the above

Solved • Sep 14, 2016

Formation Equations

Q. Naphthalene (C10H8) is a solid aromatic compound often sold as mothballs. The complete combustion of this substance to yield CO2(g) and H2O(/) at 2...

Solved • Jul 14, 2016

Formation Equations

Q. Gasoline is composed primarily of hydrocarbons, including many with eight carbon atoms, called octanes. One of the cleanest-burning octanes is a co...

Solved • Jul 13, 2016

Formation Equations

Q. Gasoline is composed primarily of hydrocarbons, including many with eight carbon atoms, called octanes. One of the cleanest-burning octanes is a co...

Solved • Jul 13, 2016

Formation Equations

Q. Write balanced equations that describe the formation of the following compounds from elements in their standard states, and use Appendix C to obtai...

Solved • Jul 13, 2016

Formation Equations

Q. Write balanced equations that describe the formation of the following compounds from elements in their stan·dard states, and use Appendix C to obta...

Solved • Jul 13, 2016

Formation Equations

Q. Write balanced equations that describe the formation of the following compounds from elements in their standard states, and use Appendix C to obtai...

Solved • Jul 13, 2016

Formation Equations

Q. Write balanced equations that describe the formation of the following compounds from elements in their standard states, and use Appendix C to obtai...

Solved • Jul 13, 2016

Formation Equations

Q. Does ΔHrxn for the reaction represented by the following equation equal the standard enthalpy of formation for CH3OH(I)? Why or why not? C(graphite...

Solved • Jul 12, 2016

Formation Equations

Q. Which of the following does not have a standard enthalpy of formation equal to zero at 25°C and 1.0 atm? a) F2 (g)  b) Al (s) c) H2 (g) d) H2O ...

Solved • May 17, 2016

Formation Equations

Q. The standard enthalpy change for the formation of silver chloride from its elements is _______ than the enthalpy change for the formation of silver...

Solved • May 9, 2016

Formation Equations

Q. In the standard enthalpy of formation, ΔH°f , for nitrogen(IV) oxide, NO2, is the enthalpy change for which reaction?  (A) N(g) + 2O(g) → NO2(g) ...

Solved • Apr 26, 2016

Formation Equations

Q. Consider the following reactions: 1.   2Al(s) + 3/2 O2 (g) → Al2O3 (s)        ΔH° = -1669.8 kJ/mol   2.   H2 (g) + 1/2 O2 (g) →  H2O (l)         ...

Solved • Feb 29, 2016

Formation Equations

Q. Predict the value of ΔHo f is greater than, less than or equal to zero for the following elements at 25oC.a) Pb (g)  b) S8 (s, rhombic)

Solved • Feb 12, 2016

Formation Equations

Q. Predict the value of ΔHo f is greater than, less than or equal to zero for the following elements at 25oC.a) Cl2 (s)                               ...

Solved • Feb 12, 2016

Formation Equations

Q. Which of O2 (g), O2 (ℓ), H2 (g), H2 (ℓ), H2O (g), H2O (ℓ) have a heat of formation equal to zero? 1. O2(g), O2(ℓ), H2(g), H2(ℓ) 2. O2(g), H2(g)...

Solved • Feb 12, 2016

Formation Equations

Q. Determine the answer for the question below.

Solved • Feb 12, 2016

Formation Equations

Q. Choose the thermochemical equation that illustrates ΔH°f for Li 2SO4. A) 2 Li+(aq) + SO42- (aq) → Li2SO4(aq) B) 2 Li(s) + 1/8 S8(s, rhombic) + 2 O2...

Solved • Feb 12, 2016

Formation Equations

Q. ΔHf° is not zero for which one of the following: O­2(g) C (graphite) F2(s) H2(g) Br­2(l)  

Solved • Feb 8, 2016

Formation Equations

Q. For which of the following reaction(s) is the enthalpy change for the reaction equal to ∆Hf° of the product? I. 2 F (g) → F2 (g) II. H2 (g) + O2 ...

Solved • Feb 5, 2016

Formation Equations

Q. Which of the following has a non-zero ΔHf°?   a. O2 (l) b. C (graphite) c. N2 (g) d. F2 (g) e. Cl2 (g)

Solved • Feb 4, 2016