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(a) How many molecules are present in a sample of an ideal gas that occupies a volume of 2.60 cm , is at a temperature

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(a) How many molecules are present in a sample of an ideal gas that occupies a volume of 2.60 cm , is at a temperature of 20"C, and is at atmospheric pressure? molecules (b) How many molecules of the gas are present if the volume and temperature are the same as in part (a), but the pressure is now 2.70 x 10 1 Pa (an extremely good vacuum)? molecules

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