Question

question 1
which compounds get a phase label of (g)?
□ h₂o
□ nh₃
□ h₂s
□ co₂

Explanation:

To determine which compounds have the phase label (g) (gas), we analyze each:

• $\ce{H2O}$: Usually liquid ($\ce{(l)}$) at standard conditions, but can be gas (steam) at high temp, but generally, the others are more commonly gaseous.
• $\ce{NH3}$ (ammonia): Gaseous at standard conditions.
• $\ce{H2S}$ (hydrogen sulfide): Gaseous at standard conditions.
• $\ce{CO2}$ (carbon dioxide): Gaseous at standard conditions.

So $\ce{NH3}$, $\ce{H2S}$, and $\ce{CO2}$ are typically gaseous; $\ce{H2O}$ is liquid (or solid/ gas in specific cases, but the other three are more consistently gaseous here).

Answer:

B. $\ce{NH3}$, C. $\ce{H2S}$, D. $\ce{CO2}$ (Note: Assuming options are labeled as A: $\ce{H2O}$, B: $\ce{NH3}$, C: $\ce{H2S}$, D: $\ce{CO2}$ for clarity. The correct compounds with phase label (g) are $\ce{NH3}$, $\ce{H2S}$, and $\ce{CO2}$.)