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Enthalpy of Formation

Q. Using the standard enthalpies of formation, what is the standard enthalpy of reaction? CO ( g ) + H 2 O ( g ) ⟶ CO 2 ( g ) + H 2 ( g )

Solved • Apr 5, 2020

Enthalpy of Formation

Q. For which of the following reaction(s) is the enthalpy change for the reaction not equal to ΔH°f of the product? I. 2H(g) → H2(g) II. H2(g) + O2(g) → H2O2(l) III. H2O(l) + O(g) → H2O2(l) A. II B. III C. I D. II and III E. I and III

Solved • Mar 30, 2020

Enthalpy of Formation

Q. 23) Given the data in the table below, ∆H° rxn for the reaction 3NO2 (g) + H2O (l) → 2HNO 3 (aq) + NO (g) is kJ.

Solved • Mar 29, 2020

Enthalpy of Formation

Q. 22) During volcanic eruptions, hydrogen sulfide gas is given off and oxidized by air according to the following chemical equation: 2H2S(g) + 3O2(g) → 2SO2(g) + 2H2O(g) Calculate the standard enthalpy change for the above reaction given: A) 443.3 kJ/mol B) 742.3 kJ/mol C) –742.3 kJ/mol D) –149.5 kJ/mol E) –1036.1 kJ/mol Is there a video on this one too? I have trouble with flipping the reaction and dealing with the different reaction/products.

Solved • Mar 27, 2020

Enthalpy of Formation

Q. Calculate the enthalpy changes for the reactions below C ---> B+A B+2C --> D Which reaction is more favorable, has more kinetic energy, more potential energy, and will the reaction be hot or cold?

Solved • Mar 24, 2020

Enthalpy of Formation

Q. Calculate ΔH° for the following reaction using the given enthalpies of formation. 2NO(g) + O2(g) → 2NO2(g) ΔHf(NO) = 90.25 kJ/mol ΔHf(NO2) = 33.18 kJ mol A. +57.07 kJ B. -57.07 kJ C. +114.14 kJ D. -114.14 kJ E. +66.36 kJ

Solved • Mar 23, 2020

Enthalpy of Formation

Q. How much heat is evolved upon the complete oxidation of 6 g of aluminum at 25°C and 1 atm pressure? ( for Al2O3 is –1676 kJ/mol.)4Al(s) + 3O2(g) → 2Al2O3(s)

Solved • Mar 19, 2020