Barrons SAT Subject Test Chemistry, 13th Edition

STP = standard temperature of 273 K standard pressure of 760 mm Hg or 1 atmosphere

(atm) or 101.3 kilopascals.

Or you can use the formula and substitute known values:

Another Example

A sample of gas occupies 24 L at 175.0 K. What volume would the gas occupy at
400.0 K?
The temperature of the gas is increased. Charles’s Law predicts that the gas
volume will also increase. So

The final volume has increased as predicted.

TIP

Boyle’s Law

P 1 V 1 = P 2 V 2

temperature is held constant

Boyle’s Law (PV = k)

Robert Boyle, a seventeenth century English scientist, found that the volume of a
gas decreases when the pressure on it is increased, and vice versa, when the
temperature is held constant. Boyle’s Law can be stated as follows:

If the Temperature Remains Constant, the Volume of a Gas Varies Inversely

as the Pressure Changes. Then