entropy of dry ice?

Question

Solid CO2 (dry ice) sublimes at 195 K and its heat of sublimation (DHsubl) = 25.2 kJ/mol. A block of dry ice with a mass of 40.6 g sublimes. What is the entropy change (DS) of the CO2? (Enter your answer in J/K).

Answer 1

Work out the moles of carbon dioxide.
Work out the heat of sublimation of that many moles.
Set delta G = 0 because it's a change of state.
So delta S = delta H/T
But convert delta H to Joules before you do the calculation!