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<strong>13</strong>-9 Ideal Gas Law in Terms of Molecules:<br />

Avogadro’s Number<br />

Since the gas constant is universal, the<br />

number of molecules in one mole is the same<br />

for all gases. That number is called Avogadro’s<br />

number:<br />

The number of molecules in a gas is the<br />

number of moles times Avogadro’s number:

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