Chemistry | Enthalpy Change Calculation for N2H4 Combustion

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In summary, enthalpy change is the difference in energy between the products and reactants of a chemical reaction. It is an important concept in chemistry as it helps us understand the energy changes in a reaction and its potential applications. The enthalpy change for the combustion of N2H4 can be calculated using the equation ΔH = ΣH(products) - ΣH(reactants) and can be affected by factors such as reactant amounts, temperature, pressure, and impurities. The enthalpy change for N2H4 combustion can be used in practical applications such as rocket propulsion and heating systems. It can also be negative, indicating an exothermic reaction that releases heat, which is typically the case for N
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Joe626
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Homework Statement

hydrzine, N2H4 ia a liquid rocket feul. It reacts with oxygen to yeild nitrogen gas and water.

N2H4 (l)+ O2 (g)--> N2 (g) + 2H2O (l)

the reaction of 6.50g N2H4 evolves 126.2 kJ of heat. Calculate the enthalpy change per mole of hydrazine combusted

I am having trouble getting started on this problem. any help with how to solve this problem will be appreciated. I am having trouble with this section :/

thanks,

Joe
 
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This is just about conversion between mass and number of moles.

6.50 g of hydrazine - how many moles?
 

FAQ: Chemistry | Enthalpy Change Calculation for N2H4 Combustion

What is enthalpy change and why is it important in chemistry?

Enthalpy change is the difference in energy between the products and reactants of a chemical reaction. It is important in chemistry because it helps us understand the energy changes that occur during a reaction, which can give us insights into the nature of the reaction and its potential applications.

How is enthalpy change calculated for the combustion of N2H4?

The enthalpy change for the combustion of N2H4 can be calculated using the equation ΔH = ΣH(products) - ΣH(reactants). This means that the enthalpy change is equal to the sum of the enthalpies of the products minus the sum of the enthalpies of the reactants.

What factors can affect the enthalpy change for the combustion of N2H4?

The enthalpy change for the combustion of N2H4 can be affected by factors such as the amount of N2H4 and O2 present, the temperature and pressure at which the reaction occurs, and any impurities present in the reactants. These factors can influence the efficiency and completeness of the reaction, thereby affecting the overall enthalpy change.

How can the enthalpy change for the combustion of N2H4 be used in practical applications?

The enthalpy change for the combustion of N2H4 can be used in practical applications such as rocket propulsion and heating systems. By understanding the energy released during this reaction, engineers can design more efficient and powerful rockets and heating systems.

Can the enthalpy change for the combustion of N2H4 be negative?

Yes, the enthalpy change for the combustion of N2H4 can be negative. This indicates that the reaction is exothermic, meaning that it releases energy in the form of heat. In the case of N2H4 combustion, the enthalpy change is typically negative, as this reaction is highly exothermic.

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