Questions: There are three sets of sketches below, showing the same pure molecular compound (ammonia, molecular formula NH3) at three different temperatures. The sketches are drawn as if a sample of ammonia were under a microscope so powerful that individual atoms could be seen. Only one sketch in each set is correct. Use the slider to choose the correct sketch in each set. You may need the following information: melting point of NH3: -77.7°C boiling point of NH3: -333°C

There are three sets of sketches below, showing the same pure molecular compound (ammonia, molecular formula NH3) at three different temperatures. The sketches are drawn as if a sample of ammonia were under a microscope so powerful that individual atoms could be seen. Only one sketch in each set is correct. Use the slider to choose the correct sketch in each set. You may need the following information: melting point of NH3: -77.7°C boiling point of NH3: -333°C
Transcript text: There are three sets of sketches below, showing the same pure molecular compound (ammonia, molecular formula $\mathrm{NH}_{3}$ ) at three different temperatures. The sketches are drawn as if a sample of ammonia were under a microscope so powerful that individual atoms could be seen. Only one sketch in each set is correct. Use the slider to choose the correct sketch in each set. You may need the following information: melting point of $\mathrm{NH}_{3}:-77.7^{\circ} \mathrm{C}$ boiling point of $\mathrm{NH}_{3}:-333^{\circ} \mathrm{C}$
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Solution

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Solution Steps

Step 1: Identify the states of matter at given temperatures
  • Melting point of NH₃: -77.7 °C
  • Boiling point of NH₃: -33.3 °C
Step 2: Determine the state of NH₃ at 26 °C
  • 26 °C is above the boiling point of NH₃ (-33.3 °C), so NH₃ will be in the gaseous state.
Step 3: Determine the state of NH₃ at -48 °C
  • -48 °C is between the melting point (-77.7 °C) and boiling point (-33.3 °C) of NH₃, so NH₃ will be in the liquid state.
Step 4: Determine the state of NH₃ at -95 °C
  • -95 °C is below the melting point of NH₃ (-77.7 °C), so NH₃ will be in the solid state.

Final Answer

  • At 26 °C: Choose the sketch showing NH₃ in the gaseous state.
  • At -48 °C: Choose the sketch showing NH₃ in the liquid state.
  • At -95 °C: Choose the sketch showing NH₃ in the solid state.
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