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yan [13]
3 years ago
8

An important step in the synthesis of nitric acid is the conversion of ammonia to nitric oxide. 4NH3(g) + 5O2(g) --> 4NO(g) +

6H2O(g) Calculate DH°rxn for this reaction. DH°f [NH3(g)] = –45.9 kJ/mol; DH°f [NO(g)] = 90.3 kJ/mol; DH°f [H2O(g)] = –241.8 kJ/mol
Chemistry
1 answer:
Rina8888 [55]3 years ago
8 0

Answer:

The ΔH°rxn for this reaction is -905.9 kJ

Explanation:

<u>Step 1:</u> Balanced reaction:

4NH3(g) + 5O2(g) --> 4NO(g) + 6H2O(g)

<u />

<u>Step 2</u>: Given data

ΔH°f [NH3(g)] = –45.9 kJ/mol

ΔH°f [NO(g)] = 90.3 kJ/mol

ΔH°f [H2O(g)] = –241.8 kJ/mol

ΔH°f of O2 is defined to be zero

<u>Step 3</u>: Calculate ΔH°rxn

ΔH°rxn = ΔH°products - ΔH°reactants

ΔH°rxn = ((4*90.3) + 6*-(241.8)) - 4*(-45.9) = -905.9 kJ

The ΔH°rxn for this reaction is -905.9 kJ

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Dmitry_Shevchenko [17]

your answer is <u>D</u><u>.</u><u> </u>physical change, because a new substance is not formed.

5 0
2 years ago
A car accelerates from rest to a speed of 24 m/s in 8 seconds. What is the car's average acceleration
densk [106]

Answer:

3 m/s

Explanation:

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4 0
2 years ago
Choose a likely identity for X, Y, and Z in these structures. A central X atom is bonded to two chlorine atoms through single bo
natka813 [3]

Complete Question

The complete question is shown on the first uploaded image

Answer:

X  is Be

Y  is B

Z  is  O            

Explanation:

In order to understand the solution, we need to that the an element form a bond based on

1  The number of valence electron available in its atom

2 The  number of electron it require to attains its stable state i.e its Octet  state

        The number of valence electron for each of the option  are

                 F = 7,   N = 5 , O = 6 , C = 4 , B = 3 , Be = 2

 Considering the first element

           We see that  X is donating  two valence electron in its atom and it is donating it to 2  Cl as Cl  only requires a single electron to achieve its stable state

Now looking  option we can see that  Be has two valence  electron in it atom and in order for it to attain its stable state it needs to release the electron so the correct option for this question is Be

Considering the second  element              

      We see that  Y is donating  three valence electron in its atom and it is donating it to 3  Cl as Cl  only requires a single electron to achieve its stable state    

    Now looking  option we can see that  B has three valence  electron in it atom and in order for it to attain its stable state it needs to release the valence electron so the correct option for this question is B

Considering the second  element  

      We see that  Z is donating two valence electron in its atom and it is donating it to 2  Cl as Cl  only requires a single electron to achieve its stable state, also Z has 2 lone-pair valence electron

       Now looking at the option we can see that  O has 6 valence electron so if it donates 2 valence electron it will still be left with 4 - pair of electron

   Therefore the correct option to this question is  O                  

6 0
3 years ago
The lewis dot notation for two atoms is shown. What is represented by this notation? K loses one portion to CI, K gains one port
telo118 [61]

Answer:

K loses one electron to CI

Explanation:

The lewis electron dot notation shows only the chemical symbol of the element surrounded by dots to represent the valence electrons.

  We have atom of K with one valence electrons

   Cl with 7 valence electrons

For an electrostatic attraction to occur, both particles must be charged. To do this, one of the species must lose an electron, and the other gains it.

This will make both species attain a stable octet;

   Hence, K will lose 1 electron and Cl will gain the electrons.

6 0
3 years ago
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NARA [144]

Answer:

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Explanation:

8 0
2 years ago
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