Homework Help Forum: Chemistry

Posted by John S. on Friday, November 6, 2009 at 4:36pm.

Consider a sample of helium and a sample of neon, both at 30ºC and 1.5atm. Both samples have a volume of 5.0 liters. Which statement concerning these samples is not true? a- each weighs the same amount b- each has the same # of atoms of gas c- the density of the neon is greater than that of the helium d- each sample contains the same # of moles of gas e- none of the above Well, I thought that the weight is the number under the symbol on the periodic table, which would be 4.003 for helium and 20.18 for neon. And that would make a not true. But I also thought that the number above the symbol on the periodic table is the number of atoms in the element, which would be 2 for helium and 10 for neon. So b would not be true. But I cant have two answers so I have to be wrong somewhere in this thinking...

• Chemistry - bobpursley, Friday, November 6, 2009 at 4:38pm

  a is indeed wrong. The number above the atom symbol is the atomic number, the number of protons in the nucleus. B is true by Avagradros hypothesis e is wrong also.

  
  

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