1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
katrin [286]
3 years ago
6

Consider the reaction between hydrazine and hydrogen to produce ammonia, N2H4(g)+H2(g)→2NH3(g). Use enthalpies of formation and

bond enthalpies to estimate the enthalpy of the nitrogen-nitrogen bond in N2H4. Express your answer in kilojoules to 3 significant figures.
Chemistry
1 answer:
sammy [17]3 years ago
6 0

Answer:

The answer is explained below:

Explanation:

Given the chemical equation:

                   N2H4(g)+H2(g)→2NH3(g)

The standard enthalpy of formation is given by the following formula:

            ΔH^0 rxn = ∑ B reactants - ∑ product

       -187.78 kJ/mol = [( 1x B N-N) + (1 x B N-H ) + (1 x b H-H)] - [ 6 x B N-H]

       -187.78 kJ/mol = [( 1x B N-N)  +(4 x 391 kJ/mol) + (1 x 436  kJ/mol)] - [ 6x 391  kJ/mol ]

        -187.78 kJ/mol =  B N-N  + (1564 + 436 - 2346) kJ/mol

                                       B   = 158.22 kJ/mol

So, in this case the enthalpy of N-N bond is 158 kJ/mol

You might be interested in
What are the examples of Alkaline Earth metals?
Elis [28]
All of group 2: 
Be (Beryllium), Mg (Magnesium), Ca (Calcium), Sr (Strontium)
5 0
3 years ago
What is the total amount of kinetic and potential energy of a substance?
Serhud [2]

Answer:

I <em><u>THINK mechanical energy</u></em>

7 0
3 years ago
The molar mass of c3h8o2 (four significant figures) is ________.
Luda [366]
So carbon is 12(3), hydrogen is 1.01 (8), and oxygen is 16(2). Add it all together and you get 76.08 amu. That's molecular. The molar would be in grams (76.08 g). Hope that answered the question. 
6 0
2 years ago
Write a full chemical equation for the reactions between magnesium and sulfuric acid
melamori03 [73]

Answer:

magnesium + hydrochloric acid → hydrogen gas + magnesium chloride

explanation:

the nitrogen in HNO3 is in the +5 oxidation state and is easily reduced. The reduction would result in the oxidation of the hydrogen gas, forming the water once again.The sulfur in H2SO4 is also in its highest oxidation state, +6.

<em>Hope</em><em> this</em><em> helps</em><em> </em><em>:</em><em>)</em>

6 0
3 years ago
What are these smooth, distinct layers most directly evidence of ?
Neko [114]

Answer: The layers of the rocks in one region of the parks are smooth and distinct, which are evidence of many, many years of deposition. The layers on the rocks are because of different deposition of sediments. Different sediments deposited over the rocks through wind, water and ice over the ages

Explanation:

5 0
2 years ago
Read 2 more answers
Other questions:
  • In chemistry class, you are given a density column with golden syrup, water, and oil. Your teacher gives you an unknown substanc
    12·2 answers
  • Magnesium wants to have 8 electrons, so it ____________ 2 electrons to another atom, so its valence shell is full and a ________
    6·1 answer
  • Why is a shoe considered individual evidence
    15·2 answers
  • Which statement(s) correctly compare the masses of protons, neutrons, and electrons? Check all that apply.
    12·1 answer
  • What is the first anmial
    13·1 answer
  • find the mass of 1 mole of cuprous oxide, or cu2o. assume the atomic mass of copper is 64 and oxygen is 16.
    14·1 answer
  • What is the chemical composition of acid rain?
    12·1 answer
  • Which of the following statements about photophosphorylation is FALSE? Energy from oxidation reactions is used to generate ATP f
    14·1 answer
  • What is the difference between oxidation and reduction
    9·2 answers
  • If something is broken into pieces will it weight more or less
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!