# Question #79862

##### 1 Answer
Mar 20, 2017

Using $P V = n R T$, the answer is .0259 moles.

#### Explanation:

You would use the equation $P V = n R T$ (affectionately referred to as "piv-nert" by chemistry lovers)

where:
P is pressure
V is volume in liters
n is moles
R is the gas constant (its values vary depending on what unit of pressure you're using)
T is temperature in kelvin

In your case:
P = 735 mmHg
V = 660 mL = .660 L
n = ?
R = 62.4 $\frac{L \cdot m m H g}{K \cdot m o l}$
T = 27 Celsius = 27 + 273 = 300 degrees kelvin

$\left(735\right) \left(.660\right) = \left(n\right) \left(62.4\right) \left(300\right)$

solve for n and the answer is .0259 moles.