What volume will 20.0g of argon occupy at stp?

Molar mass Argon = 39.948 g/mol

1 mol 39.948 g
  mol 20.0 g 

mol = 20.0 * 1 / 39.948

= 0.5006 moles

1 mol 22.4 L ( at STP )
0.5006 moles L 

L = 0.5006 * 22.4

= 11.21 L

hope this helps!

Hello thereone of the following properties was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version. which property fits this description? answer: atomic mass  was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.