How many moles of argon atoms are present in 11.2 L of argon gas at STP?
What is the molar volume at
Well, the molar volume at
So you have a volume of
We note that
Using the current recommended STP values of
Using the older standard, as indicated in the explanation,
Current values for STP are
At these current values, the molar volume of a gas is
In order to determine the number of moles of the given volume of Ar, divide the given volume by the molar volume of an ideal gas,
Simplify by multiplying by the inverse of the molar volume.
Using the older STP values of