Problem: The element gallium (Ga) freezes at 29.8°C, and its molar enthalpy of fusion is ΔH fus = 5.59kJ/mol.1. When molten gallium solidifies to Ga(s) at its normal melting point, is ΔS positive or negative?2. Calculate the value of ΔS when 70.0g of Ga(l) solidifies at 29.8°C. ΔS = ?

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FREE Expert Solution

At constant temperature, the change in entropy can be expressed as:

Where: Q = heat , T = Temperature

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Problem Details

The element gallium (Ga) freezes at 29.8°C, and its molar enthalpy of fusion is ΔH fus = 5.59kJ/mol.

1. When molten gallium solidifies to Ga(s) at its normal melting point, is ΔS positive or negative?

2. Calculate the value of ΔS when 70.0g of Ga(l) solidifies at 29.8°C. ΔS = ?

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Our tutors have indicated that to solve this problem you will need to apply the Entropy concept. You can view video lessons to learn Entropy. Or if you need more Entropy practice, you can also practice Entropy practice problems.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Topich's class at VCU.