Which law states that equal volumes of all gases at identical temperature and pressure contain the same number of molecules?
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Answer: D. Avogadro’s law
Explanation
Avogadro's law establishes a fundamental direct relationship between the volume and particle count of gases. Equal gas volumes measured at identical temperature and pressure conditions contain the exact same number of molecules. This principle holds true regardless of the chemical identity or molar mass of the gas being measured. Amadeo Avogadro proposed this foundational hypothesis in eighteen eleven to advance early atomic theory. One mole of any ideal gas occupies twenty-two point four liters at standard temperature and pressure. Ideal gas behavior assumes negligible molecular volume and absence of intermolecular attractive forces.
This law allows chemists to determine stoichiometric mole ratios directly from gas volume measurements in reactions. Avogadro's principle is essential for calculating molecular weights of volatile compounds from density data. Atmospheric scientists use these gas laws to model weather patterns and upper-atmosphere gas compositions. Boyle's law describes how gas volume decreases as applied external pressure increases at constant temperature. Charles' law dictates that gas volume expands linearly with increasing absolute temperature at constant pressure. Gay-Lussac's law governs the proportional rise in gas pressure when temperature increases at constant volume.
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