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# What volume of hydrogen chloride gas, HCl, has the same number of atoms as 20.0 L of xenon gas at the same temperature and pressure?

What volume of hydrogen chloride gas, HCl, has the same number of atoms as 20.0 L of xenon gas at the same temperature and pressure?

A.6.67 L

B.10.0 L

C.20.0 L

D.40.0 L

E.60.0 L

### 1 Answer

Relevance

- Roger the MoleLv 74 weeks ago
Xenon is monatomic. HCl is diatomic. So for those two gases to have the same number of atoms there must be twice as much Xe as there is HCl. In order for there to be twice as much Xe as HCl (at the same T and P) Xe must have twice the volume of HCl. So if there is 20.0 L of Xe, the volume of HCl must be 20.0 L / 2 =

10.0 L HCl.

So answer B.

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