# What is the pressure (in torr) inside a 2.0 liter flask at 26°C and 27.2 grams of oxygen gas?

**Answer:**

We use the equation pV = n RT

molar mass O2 = 32 g/mol

n = moles O2 = 27.2 / 32 = 0.85

T = 26 + 273 = 299 K

p = nRT / V = 0.85 x 0.0821 x 299 / 2.0 = 10.4 atm

Since 1 atm = 760 torr

10.4 x 760 = 7929 torr

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