What is the entropy of Br2?
Entropy of liquid at standard conditions (nominally 298.15 K, 1 atm.)
| S°liquid (J/mol*K) | 152.21 ± 0.30 |
| Method | Review |
| Reference | Cox, Wagman, et al., 1984 |
| Comment | |
|---|---|
| CODATA Review value |
Which has higher entropy?
Gases
Entropy is a measure of randomness or disorder in a system. Gases have higher entropy than liquids, and liquids have higher entropy than solids.
What is the enthalpy of bromine?
The enthalpy of formation for Br (monoatomic gas) is 111.881 kJ/mol.
What determines the entropy of a solid?
The entropy of a perfectly-ordered solid at 0 K is zero. The absolute entropy of a substance at any temperature above 0 K must be determined by calculating the increments of heat q required to bring the substance from 0 K to the temperature of interest, and then summing the ratios q/T.
Is 2 BR g → Br2 g endothermic or exothermic?
Br2(g) to 2Br(g) will be a bond-breaking reaction which is an endothermic reaction.
What is the enthalpy of i2?
Inorganic substances
| Species | Phase | ΔfH⦵ /(kJ/mol) |
|---|---|---|
| Iodine | ||
| Iodine | Solid | 0 |
| Iodine | Gas | 62.438 |
| Iodine | Aqueous | 23 |
Is solid to gas positive entropy?
One mole of a gas and one mole of a solid are produced from one mole of a solid. Since gases have so much more entropy than solids, the entropy change of this reaction is positive.
Does entropy increase from solid to gas?
For a given substance, the entropy of the liquid state is greater than the entropy of the solid state. Likewise, the entropy of the gas is greater than the entropy of the liquid. Therefore, entropy increases in processes in which solid or liquid reactants form gaseous products.
How does entropy change from gas to solid?
Thus, the entropy decreases. One mole of a gas and one mole of a solid are produced from one mole of a solid. Since gases have so much more entropy than solids, the entropy change of this reaction is positive. Since the number of moles of gas has increased, the entropy change of this reaction is positive.
What is entropy of a gas?
A more correct definition of the entropy S is the differential form that accounts for this variation. dS = dQ / T. The change in entropy is then the inverse of the temperature integrated over the change in heat transfer. For gases, there are two possible ways to evaluate the change in entropy.