Count the moles of gas, call the sign, then check the table. Every S° here is the real value at 298.15 K and 1 bar, taken from Appendix G of OpenStax Chemistry 2e.
Entropy on each sidepress a button to call it
Where the numbers come fromn × S° for each species
Reaction 1 of 10
?J/K ΔS°your call?
moles of gas, reactants
moles of gas, products
change in gas moles
Your call0 right of 0
How to call it
Count the gas first
Gas carries far more entropy than liquid or solid. If the moles of gas rise, pick rises. If they fall, pick falls. If they tie, pick barely changes and let the phases decide.