# Entropy

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Tungsten has been used to make light bulb filaments since 1908. The melting point of tungsten is 3422C and the heat of fusion is 35 kJ/mole. Calculate the entropy change associated with the melting of one mole of tungsten.

• Entropy -

Divide the heat of fusion by the Kelvin temperature of the melting point. That will be the entropy change. Make sure you convert 3422 C to Kelvin.

• Entropy -

Thank you. I was missing the units the whole time.

S = H/T

Convert kj to Joules; convert C to K.

• Entropy -

Entropy is sometimes stated in kJ/mole K, but you are right, kcal/mole K is more common

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