American Chemical Society (ACS) Chemistry Test 2025 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 400

What is the standard molar volume of a gas at STP?

20.4 L

22.4 L

The standard molar volume of a gas at standard temperature and pressure (STP) is defined as the volume occupied by one mole of an ideal gas under these conditions. At STP, which is typically defined as a temperature of 0 °C (273.15 K) and a pressure of 1 atm, the volume of one mole of gas is approximately 22.4 liters. This value arises from the ideal gas law, where at standard conditions, gases behave in a way that this specific volume is characteristic.

This is a fundamental concept in chemistry because it provides a reference point for calculations involving gaseous substances. Understanding this volume is crucial for stoichiometric calculations and conversions involving the amounts of gases in reactions.

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24.5 L

25.0 L

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