For the Reaction CuS(s) + H₂(g) $\leftrightharpoons$ H₂S(g) + Cu(s) $\Delta$ G ^$\circ$

question 3

Multiple Choice

For the reaction CuS(s) + H₂(g) $\leftrightharpoons$ H₂S(g) + Cu(s) ,
$\Delta$ G ^$\circ$ _f (CuS) = -53.6 kJ/mol
$\Delta$ G ^$\circ$ _f (H₂S) = -33.6 kJ/mol
$\Delta$ H ^$\circ$ _f (CuS) = -53.1 kJ/mol
$\Delta$ H ^$\circ$ _f (H₂S) = -20.6 kJ/mol
Calculate the value of the equilibrium constant (K_p) at 798 K and 1 atm pressure.

• A) 1.77
• B) 1.57
• C) 1.37
• D) 1.17
• E) None of the above

---

Definitions:

Realized Niche

The lifestyle that an organism actually pursues, including the resources that it actually uses. An organism’s realized niche is narrower than its fundamental niche because of interspecific competition. Compare with fundamental niche.

Trophic Level

Each sequential step of matter and energy in a food web, from producers to primary, secondary, or tertiary consumers; each organism is assigned to a trophic level based on its primary source of nourishment.

Bumper Acorn Crops

Phenomenon where oak trees produce an unusually abundant amount of acorns at certain times, influenced by various environmental factors.

Lyme Disease

A bacterial infection transmitted to humans through the bite of infected black-legged ticks, characterized by fever, headache, fatigue, and a characteristic skin rash.