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MDCAT Chemistry QUESTION #4369
Question 1
Which of the following is true about pressure for an ideal gas at $-273\ °C$?
  • $P = 1\ atm$
  • $P = 2\ atm$
  • $P = 3\ atm$
  • $P = 0\ atm$✔️
Correct Answer Explanation
$-273\ °C = 0\ K$ (absolute zero). By the ideal gas law $PV = nRT$, at $T = 0\ K$, $P = \frac{nRT}{V} = 0$. At absolute zero, all molecular motion ceases and pressure becomes zero.