Question
Asked Nov 1, 2019
2 views

Use standard enthalpies of formation to determine ΔHorxn for:

2NH3(g) + 3O2(g) + 2CH4(g) → 2HCN(g) + 6H2O(g)

Enter in kJ.

check_circle

Expert Answer

Step 1

Given information:

help_outline

Image Transcriptionclose

2NH, (g)30, (g) +2CH (g)2HCN (g) 6H,0(g)

fullscreen
Step 2

The chemical equation for enthalpy of formation of product and reactants are represented as follows:

 

help_outline

Image Transcriptionclose

5H, (g)+C(s, gr) HCNΝ(s).. ... . . . . Ηf (1) = 135.1 k/mol ... ..6 Ε H,(8), (8)HO(1). 0,(8)HO( .ΔΗf (2 ) - -285.83 k/mol N, (8)+5 Η, (s) > NH, (ε).... . .ΔΗ'f (3 ) = -46.11 kJmol ο, (s) -0 (g)........ C(s, gr)+2H, (g)CH, (8) ........ . .ΔΗ=0 .ΔΗf (4 ) - -74.84 kJmol

fullscreen
Step 3

Applying Hess Law and plugging the values of enthalpy of formation of product...

help_outline

Image Transcriptionclose

ΔΗΣΔΗof (products ) -ΣΔΗf (reac tants ) ΔΗ[2 ΔΗf(1) + 6 ΔΗΙ (2)]-[2ΔΗ (3) +2xΔΗf (4)] [2x135.1+6x-285.83] kJ/mol-[2x-46.11+2x -74.81] kJ/mol =-1202.94 kJ/mol

fullscreen

Want to see the full answer?

See Solution

Check out a sample Q&A here.

Want to see this answer and more?

Solutions are written by subject experts who are available 24/7. Questions are typically answered within 1 hour.*

See Solution
*Response times may vary by subject and question.
Tagged in

Science

Chemistry

Physical Chemistry

Related Chemistry Q&A

Find answers to questions asked by student like you
Show more Q&A
add
question_answer

Q: Estimate the number of millimoles of Ca(NO3) 2  that contain 4.78 x 1022 formula units of Ca(NO3)2. ...

A: The term formula unit in chemistry can be defined as the empirical formula of a given covalent or io...

question_answer

Q: Calculate the solubility at 25°C of CaF2 in pure water and in a 0.0060M  NaF solution. You'll find K...

A: The equation can be written as follows,

question_answer

Q: A 100.0-mL flask contains 0.250 g of a volatile oxide of nitrogen. The pressure in the flask is 760....

A: Ideal gas equation is also known as gas density equation. The ideal gas equation is shown below.

question_answer

Q: [Review Topics] [saouerajas Draw a structural formula of the SR configuration of the compound shown ...

A: The original molecule is

question_answer

Q: What is the hybridization of the two oxygen atoms in the amino acid glycine, shown above?  Lone pair...

A: The Lewis structure of Glycine:

question_answer

Q: [Review Topics) References] M Identify the absolute configuration of the chirality centers in each o...

A: Absolute configuration is done on the basis of priority, the group with high atomic number get the h...

question_answer

Q: Fill in the blank: potassium oxalate is added to the washed precipitate. Potassium oxalate dissociat...

A: The complete given reaction is,

question_answer

Q: In the reaction of silver nitrate with sodium chloride, how many grams of silver chloride will be pr...

A: The balanced equation and the moles of silver nitrate formed can be given as

question_answer

Q: What assumption is being made in determining each of the following?    The mass of the vapor. The v...

A: The gas has to be considered as ideal one.  It helps to identify mass,  volume, temperature and pres...