Question

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.

Answer 1

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.

Answer 2

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

S = H/T

Convert kj to Joules; convert C to K.

Answer 3

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