Based on the bond energies given, the enthalpy change for the reaction of is -33 kJ and the reaction is exothermic.
<h3>What is the change in bond energy of a reaction?</h3>
The change in bond energy of a reaction is calculated using the formula below:
- change in bond energy = sum of energies of bonds broken - sum of energies of bonds formed
A reaction is exothermic if the change in bond energy is negative.
A reaction is endothermic if the change in bond energy is positive.
Given the bond enery values above:
sum of energies of bonds broken = 4 × C-H + Br-Br
sum of energies of bonds broken = 4 × 413 + 193 = 1845 kJ
sum of energies of bonds formed = 3 × C-H + C-Br + H-Br
sum of energies of bonds formed = 3 × 413 + 276 + 363 = 1878 kJ
Thus;
change in bond energy = 1845 - 1878 = -33 kJ
- The reaction is exothermic because the change in bond energy is negative.
Therefore, the enthalpy change for the reaction of is -33 kJ and the reaction is exothermic.
Learn more about enthalpy change at: brainly.com/question/11628413
Answer: About 0.20 grams of copper (II) is formed, and some aluminum is left in the reaction mixture
When the solution is heated, the water evaporates. ... The salt does not evaporate and so it stays behind. Salt solution is heated.
Answer: 3378.4mL
Explanation:
density of Gasoline = 0.74g/mL.
Volume of gasoline in milliliter = ?
mass of gasoline = 2.5kg
(Since density is in grams per millilitre, convert mass in kilograms to grams)
If 1kg = 1000grams
2.5kg = 2.5 x 1000 = 2500grams
Recall that density is obtained by dividing the mass of a substance by its volume
i.e Density = Mass / Volume
0.74g/mL = 2500grams/Volume
Volume = (2500 grams / 0.74g/mL)
Volume = 3378.4mL
Thus, the volume of gasoline is 3378.4mL
Answer: A) Ar
Explanation: Argon [Ar] has an atomic no of 18 and the electronic configuration is:
Ar :
Chlorine [Cl] has atomic no of 17 and thus the electronic configuration is :
Cl :
Magnesium [Mg] has atomic no of 12 and thus the electronic configuration is :
Mg :
Sodium has atomic no of 11 and thus the electronic configuration is :
Cl :
As we move across a period the number of electrons are being added to the same shell but the number of protons increases, thus the electrons are being tightly held and thus the atomic radius keeps on decreasing.
Thus the smallest atom would have a tightly bound electron nearer to the nucleus. As argon is the last element of the period, it is the smallest in the period and thus largest amount of energy will be required to remove the outermost electron.