Posted by Kiesha on Wednesday, December 1, 2010 at 11:00am.
You don't need an steps. Avogadro's Law says that equal volume of (ideal) gases at the same temperature and pressure contain the same number of molecules. So you had 3.00 L of one gas, you look for the answer of 3.00 L of another gas if you are looking for the same number of molecules.
You MAY calculate if you wish, using the ideal gas law equation.
PV = nRT
For the same P, V, and T, n will be the same for any gas; therefore, the number of molecules will be the same.
How many moles are present in 30.0 L of helium gas at STP?
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