Identify each enthalpy change by name and classify each change as exothermic or endothermic.

1. 1 mol NaCl (s) à 1 mol NaCl (l)

2. C4H10 O (l) à C4H10O (g)

3. H2O (g) à H2O (l)

4. 1 mol NaCl (s) + 3.88 kJ/molà 1 mol NaCl (aq)

A Molar heat of solution; endothermic

B Molar heat of vaporization; endothermic

C Molar heat of fusion; endothermic

D Molar heat of condensation; exothermic

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Identify each enthalpy change by name and classify each change as exothermic or endothermic.

1. 1 mol NaCl (s) à 1 mol NaCl (l)

2. C4H10 O (l) à C4H10O (g)

3. H2O (g) à H2O (l)

4. 1 mol NaCl (s) + 3.88 kJ/molà 1 mol NaCl (aq)

A Molar heat of solution; endothermic

B Molar heat of vaporization; endothermic

C Molar heat of fusion; endothermic

D Molar heat of condensation; exothermic

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Yurem Braun · Answer 1

We classify them as follows:

1. 1 mol NaCl (s) à 1 mol NaCl (l)

C Molar heat of fusion; endothermic

2. C4H10 O (l) à C4H10O (g)

B Molar heat of vaporization; endothermic

3. H2O (g) à H2O (l)

D Molar heat of condensation; exothermic

4. 1 mol NaCl (s) + 3.88 kJ/molà 1 mol NaCl (aq)

A Molar heat of solution; endothermic