How much energy will be released?

In summary, the enthalpy of neutralization for the reaction of a strong acid with a strong base is -56 kJ/mol of water produced. To calculate the energy released when 195.0 mL of 0.400 M HCl is mixed with 155.5 mL of 0.500 M NaOH, we can use the equation c=n/V to determine the number of moles. The total number of moles is (0.4*0.195) + (0.1555*0.5), which gives us 0.1257 moles. Multiplying this by -56 kJ/mol gives us -7.03 kJ. However, this is not the correct answer, and
  • #1
JessicaHelena
188
3

Homework Statement


The enthalpy of neutralization for the reaction of a strong acid with a strong base is -56 kJ/mol of water produced. How much energy will be released when 195.0 mL of 0.400 M HCl is mixed with 155.5 mL of 0.500 M NaOH?

Homework Equations


c=n/V

The Attempt at a Solution


to get n (from c=n/V), we can do c*V.
In this case, the total moles is then 0.4*.195 + .1555 * 0.5 moles
and multiplying that by -56kJ/mol gave me -8.722 kJ, but that's wrong... Why?
 
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  • #2
Do all moles react ? Write out the 'reaction' equation and underneath put the # of moles for each.
 

1. How is energy released?

Energy can be released through various processes such as chemical reactions, nuclear reactions, and mechanical processes. For example, when a fuel like gasoline is burned, the chemical energy stored in its bonds is released as heat and light.

2. How is the amount of energy released determined?

The amount of energy released depends on the specific process and the amount of matter involved. For chemical reactions, the energy released is determined by the difference in energy between the products and reactants. For nuclear reactions, the amount of energy released is determined by the mass difference between the reactants and products, as described by Einstein's famous equation, E=mc².

3. What are the units used to measure energy released?

The most common unit used to measure energy released is joules (J). However, other units such as calories (cal) and kilowatt-hours (kWh) may also be used depending on the context.

4. How does the release of energy impact the environment?

The release of energy can have both positive and negative impacts on the environment. For example, the burning of fossil fuels for energy releases pollutants into the atmosphere, contributing to air pollution and climate change. On the other hand, the use of renewable energy sources such as solar and wind power can help reduce harmful emissions and mitigate environmental damage.

5. Can the amount of energy released be controlled or harnessed?

Yes, the amount of energy released can be controlled through various means such as regulating the amount of fuel used in a reaction or controlling the conditions in which the reaction takes place. Additionally, energy can be harnessed and converted into other forms such as electricity for practical use.

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