# Chemistry?

A 3.1 µL ampoule of xenon has a pressure of

1 Torr at 10 ◦C. How many Xe atoms are

present?

Answer in units of atoms.

### 1 Answer

Relevance

- pisgahchemistLv 74 weeks ago
Xenon ....

PV = nRT ........... ideal gas equation

n = PV / RT ........ solve for n (moles)

n = 1.00 torr x 3.1x10^-6L / 62.36 Ltorr/molK / 283K

n = 1.76x10^-10 mol

1.76x10^10 mol Xe x (6.022x10^23 atoms Xe / 1 mol Xe) = 1.06x10^14 atoms Xe ............. round to two significant digits: 1.1x10^14 atoms Xe

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