Calculate the heat of reaction ΔH for the following reaction:H2(g)+ Cl2(g)→2HCl(g)You can find a table of bond energies by using the Data button on the ALEKS toolbar.Round your answer to the nearest /kJmol.
Question
Calculate the heat of reaction ΔH for the following reaction:H2(g)+ Cl2(g)→2HCl(g)You can find a table of bond energies by using the Data button on the ALEKS toolbar.Round your answer to the nearest /kJmol.
Solution
To calculate the heat of reaction (ΔH), you need to know the bond energies of the reactants and products. The bond energy is the amount of energy required to break one mole of a bond in a substance.
Step 1: Look up the bond energies for the reactants and products.
For H2, the bond energy is 436 kJ/mol. For Cl2, the bond energy is 242 kJ/mol. For HCl, the bond energy is 431 kJ/mol.
Step 2: Calculate the total energy of the reactants.
The total energy of the reactants is the sum of the bond energies of H2 and Cl2.
Total energy of reactants = 436 kJ/mol + 242 kJ/mol = 678 kJ/mol
Step 3: Calculate the total energy of the products.
The total energy of the products is twice the bond energy of HCl, because there are two moles of HCl in the products.
Total energy of products = 2 * 431 kJ/mol = 862 kJ/mol
Step 4: Calculate the heat of reaction (ΔH).
The heat of reaction is the difference between the total energy of the products and the total energy of the reactants.
ΔH = Total energy of products - Total energy of reactants ΔH = 862 kJ/mol - 678 kJ/mol = 184 kJ/mol
So, the heat of reaction for the given reaction is 184 kJ/mol.
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