How is stoichiometry used to calculate energy released when a mass of liquid freezes?A.Grams liquid × mol/g × HfB.Grams liquid × mol/g × HvapC.Grams liquid × mol/g × HreactionD.Grams liquid × mol/g × Hfusion
Question
How is stoichiometry used to calculate energy released when a mass of liquid freezes?A.Grams liquid × mol/g × HfB.Grams liquid × mol/g × HvapC.Grams liquid × mol/g × HreactionD.Grams liquid × mol/g × Hfusion
Solution
Stoichiometry is used to calculate the energy released when a mass of liquid freezes through the following steps:
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Identify the substance that is freezing and find its molar heat of fusion (Hfusion). This is the amount of energy needed to change one mole of the substance from a solid to a liquid or vice versa. It is usually given in units of kJ/mol or J/mol. In this case, we are looking for the energy released, so we will use the negative of this value.
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Convert the mass of the liquid to moles using its molar mass. The molar mass is usually given in g/mol. This can be done by dividing the mass of the liquid by its molar mass (Grams liquid × mol/g).
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Multiply the number of moles by the molar heat of fusion to find the total energy released (Moles × -Hfusion).
So, the correct answer is D. Grams liquid × mol/g × Hfusion.
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