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Question

Calculate the number of P atoms in one mole of P4?


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Solution

Step 1: Understand Avogadro's law

According to Avogadro's law, similar volumes of various gases contain an equal number of molecules under the same circumstances of temperature and pressure (or, if remains constant).

This relationship is derived from the kinetic theory of gases under the assumption of ideal gas conditions.

One mole of a material or element is equal to 6.023×1023 units of that substance, such as atoms, molecules, or ions, according to the law.

This value, 6.023×1023 is known as Avogadro's number or Avogadro's constant.

Step 2: Find number of P atoms in one mole of P4

One mole of P4 =6.023×1023 molecules of P4.

One molecule of P4=4atomsofP

Therefore, one mole of

P4=4x6.023x1023atomsofP=24.092x1023atomsofP

So, the number of P atoms in one mole of P4 is 24.092x1023.


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