Which of the following statement about Avogadro's hypothesis is correct?
Correct answer: B. Under similar conditions of temperature and pressure, equal volumes of all gases contain same number of molecules.
- A. Under similar conditions of temperature and pressure, gases react with each other in simple ratio.
- B. Under similar conditions of temperature and pressure, equal volumes of all gases contain same number of molecules.
- C. At NTP all gases contain same number of molecules.
- D. Gases always react with gases only at given temperature and pressure.
Explanation
Avogadro's hypothesis states that equal volumes of gases at the same temperature and pressure contain the same number of particles, regardless of their chemical nature and physical properties. This hypothesis is the basis for the concept of the mole, which is a unit of measurement used in chemistry to express the amount of a substance. One mole of a substance is defined as the amount of that substance that contains the same number of particles as there are atoms in exactly 12 grams of carbon-12.
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About Fundamental Concepts of Chemistry
Mole calculations connect mass, number of particles and Avogadro's number, while balanced equations provide the mole ratios used in stoichiometry. Questions cover limiting and excess reactants, theoretical yield and percentage yield, including identifying which reactant is consumed first and comparing the actual product with the maximum possible product.
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