A gas is sealed in a rigid canister at a temperature of –5.0°C and a pressure of 713 mmHg. Which of the following actions would most likely bring the gas to STP?

STP is 0°C and 760 mmHg, so the gas needs to become warmer and its pressure needs to rise. In a rigid canister, heating raises both temperature and pressure; warming from –5.0°C to 0°C would raise the pressure from 713 mmHg to about 726 mmHg, moving it toward STP. Adding gas would raise pressure but leave the temperature below 0°C, while removing gas or using a larger canister would lower pressure.

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