Which of the following pairs contain equal number of atoms? (1) 11.2 cc of the N2 and 0.015 g o

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Which of the following pairs contain equal number of atoms?...

Which of the following pairs contain equal number of atoms? (1) $11.2 \mathrm{cc}$ of the $\mathrm{N}_{2}$ and $0.015 \mathrm{~g}$ of nitric oxide (2) $22.4$ litres of nitrous oxide and $22.4$ litres of nitric oxide (3) 1 milli mole of $\mathrm{HCl}$ and and $0.5$ milli mole of $\mathrm{H}_{2} \mathrm{~S}$ (4) 1 mole of $\mathrm{H}_{2} \mathrm{O}_{2}$ and 1 mole of $\mathrm{N}_{2} \mathrm{O}_{4}$

Which of the following pairs contain equal number of atoms?
(1) $11.2 \mathrm{cc}$ of the $\mathrm{N}_{2}$ and $0.015 \mathrm{~g}$ of nitric oxide
(2) $22.4$ litres of nitrous oxide and $22.4$ litres of nitric oxide
(3) 1 milli mole of $\mathrm{HCl}$ and and $0.5$ milli mole of $\mathrm{H}_{2} \mathrm{~S}$
(4) 1 mole of $\mathrm{H}_{2} \mathrm{O}_{2}$ and 1 mole of $\mathrm{N}_{2} \mathrm{O}_{4}$

Key Concepts

Gas Volume at Standard Temperature and Pressure (STP)

Under standard temperature and pressure (STP), one mole of any ideal gas occupies a fixed volume, commonly taken as 22.4 liters. This relationship is crucial when comparing different gaseous substances in terms of moles and thereby linking their volume to the number of particles they contain.

Molecular Composition

Molecular composition refers to the way atoms are arranged and connected in a molecule. It is essential for determining the total number of atoms present in a given sample of a compound because different molecules can contain different numbers of atoms, even if the number of molecules is the same.

Mass-Mole Conversion

Mass-mole conversion is the process of converting a given mass of a substance to moles using its molar mass. This conversion is fundamental in stoichiometric calculations, as it allows the determination of the number of molecules or atoms present based on a measured mass.

Mole Concept

The mole concept is a fundamental idea in chemistry that describes amounts of substance. It allows chemists to convert between the number of particles (atoms, molecules, or ions) and a measurable quantity such as mass, volume, or number of molecules by using the standard mole, which is defined as containing Avogadro's number (approximately 6.022 x 10^23) of entities.

Avogadro's Number

Avogadro's number (6.022 x 10^23) is the number of constituent particles, usually atoms or molecules, found in one mole of a substance. This concept provides a direct link between the microscopic count of particles and the macroscopic amounts measured in the laboratory.

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