To determine the number of molecules in 3.5 moles of a gas, Steve needs AVAGADRO NUMBERS as additional information.
Avagadro numbers tell the molecules in a mole of a substance or the number of atoms.
For example, a mole of hydrogen molecules is 2 grams while a mole of hydrogen atoms happens to be 1 gram.
This Avogadro's number is 6.023 X 10^23.
It is the basis of the mole unit of measurement. The units may be electrons, ions, or molecules, depending upon the nature of the substance.
Here is more information on the Avagadro number :
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