What is the enthalpy change when 1 mole of NaCl is dissolved in water?

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Question: What is the enthalpy change when 1 mole of NaCl is dissolved in water?

Options:

Correct Answer: -3.87 kJ

Solution:

The enthalpy change when 1 mole of NaCl is dissolved in water is approximately -3.87 kJ.

What is the enthalpy change when 1 mole of NaCl is dissolved in water?

What is the enthalpy change when 1 mole of NaCl is dissolved in water?

Step 1: Understand that enthalpy change refers to the heat energy change during a process.
Step 2: Recognize that dissolving NaCl (table salt) in water is an endothermic process, meaning it absorbs heat.
Step 3: Know that when 1 mole of NaCl is dissolved in water, it releases energy, which is measured as a negative enthalpy change.
Step 4: Look up the specific enthalpy change value for dissolving NaCl in water, which is approximately -3.87 kJ.
Step 5: Conclude that the enthalpy change when 1 mole of NaCl is dissolved in water is -3.87 kJ.

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