Which of the following reactions will result in a decrease in entropy?

For the following reactions, indicate whether the entropy of the system increases, decreases, or remains nearly the same. a. Al3+(aq) + 3 OH-(aq) → Al(OH)3(s)b. CaCO3(s) → CaO(s) + CO2(g)c. Mg(s) + Cu2+(aq) → Mg2+(aq) + Cu(s)

Which reaction below has a positive change in entropy? O 2 N20 (g) --> 2 N2 (g) O2 (e) O N2 (g) + 3 H2 (g) -- 2 NH3 (g) O 2 KCIO3 (s) --> 2 KCI (s) + 3 O2 (g) O 2 H2 (e) C2H2 (g)--> C2H, (g).

1. Please consider 0.15 gm of Constantan (a Cu/Ni alloy widely used in thermocouples, c = 390 J/•K-kg) that cooled through exposure to the laboratory atmosphere (T 22 •C) from 620 C to 20 C. a. Please determine the change in entropy of the Constantan (in J/ K- kg). b. Please determine the change in entropy of the laboratory atmosphere (in J/ K-kg). c. Please determine the change in entropy of the universe (in J/ K-kg). %3D

6. Which of the following compounds has the highest entropy at 25°C? A. CO₂ (s) B. CH3CH₂OH (1) C. C₂H6 (g) D. S (s) E. H₂O (1)

Discuss the spontaneity of each process in the following scenarios, based on the use of the Gibbs free energy equation: a.  N2 (g) + 3 H2 (g) ← → 2 NH3 (g) , ΔH = -46.11 kJ/molb.  An exothermic reaction with an increase in entropyc.  A block of solid carbon dioxide subliming to gaseous carbon dioxide

A) for the reaction MgCo3(s) ---> MgO (s) +CO2 we can say that it is a reaction a. spontaneous b. not spontaneous c.in balance d. indeterminate B) Which substance in the following pair of compounds must have the highest standard molar entropy? C2H2 (g) or C2H6(g) a.C2H2(g) b.C2H6 c.C2H2=C2H6(g) d. undetermined