Answer Enthalpy Change Atomisation Hydrazine: B 1720 kJ

In summary, hydrazine was a commonly used fuel for various rockets and spacecrafts in World War II and the American space program. The question asks for the enthalpy change of atomization for 1 mol of gaseous hydrazine, and provides four options for the answer. The use of a data booklet is relevant to solving this question. The conversation also includes a discussion about the correct equation and bond enthalpies from the data booklet. The attempted solution involves using the equation Ʃ(bond breaking energy) - Ʃ(bond making energy), which results in a value of 146J/mol, not matching any of the given options. Finally, there is a question about the definition of "atom
  • #1
mutineer123
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Homework Statement



Hydrazine was used as a fuel for the Messerschmidt 163 rocket fighter in World War II and for the
American Gemini and Apollo spacecraft .

What is the enthalpy change of atomisation of 1 mol of gaseous hydrazine?
A 550 kJ
B 1720 kJ
C 1970 kJ
D 2554 kJ
Use of the Data Booklet is relevant to this question


Homework Equations





The Attempt at a Solution



Is my equation correct?
N2(g) + 2H2(g) → N2H4(g)

The bond enthalpy for the N2(triple bond) in the data book let is 994. H2 is 436. N-N is 160 and N-H is 390 (if you need other bond enthalpies from the data booklet Il be happy to provide them)
I know that one of the ways to find the enthalpy change is Ʃ(bond breaking energy) - Ʃ(bond making energy). So i got 1866-1720= 146J/mol. Which is NOT IN THE OPTION!
 
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  • #2


What is "atomization"?
 

What is enthalpy change of atomisation?

Enthalpy change of atomisation is the energy required to break apart 1 mole of a substance into its individual atoms in the gaseous state.

What is the enthalpy change of atomisation for hydrazine?

The enthalpy change of atomisation for hydrazine (N2H4) is B 1720 kJ/mol.

Why is the enthalpy change of atomisation of hydrazine important?

The enthalpy change of atomisation for a substance is important because it provides information about the strength of the bonds between its atoms. In the case of hydrazine, the high enthalpy change of atomisation indicates that the bonds between its atoms are strong, making it a stable compound.

How is the enthalpy change of atomisation of hydrazine measured?

The enthalpy change of atomisation is typically measured using a bomb calorimeter, which is a device that measures the heat released or absorbed during a chemical reaction. The enthalpy change of atomisation for hydrazine can also be calculated using Hess's law and the enthalpy of formation for N2H4.

What factors can affect the enthalpy change of atomisation?

The enthalpy change of atomisation can be affected by factors such as temperature, pressure, and the type of bonds between the atoms in a substance. It can also be influenced by the presence of impurities or other substances in the reaction environment.

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