Which of the following properties of gases can be directly measured in a laboratory setting?

• A. Electronegativity
• B. Molar mass
• C. Pressure
• D. Atomic number

Answer: (C)

Verified step by step guidance

1. Understand the properties listed: Electronegativity, Molar mass, Pressure, and Atomic number.
2. Recall that electronegativity is a measure of an atom's ability to attract electrons in a chemical bond and is not directly measurable; it is derived from experimental data.
3. Recognize that molar mass is a calculated property based on atomic masses of elements in a compound, not something measured directly in a gas sample without additional analysis.
4. Know that pressure is a physical property of gases that can be directly measured using instruments like a manometer or barometer in a laboratory.
5. Atomic number is a fundamental property of an element representing the number of protons in the nucleus and is not measured directly in a gas sample but known from the element's identity.