# The temperature of 200.0 mL of a gas originally at STP is changed to -25C at constant volume. Calculate the pressure of the gas in atm? (0.91 atm)

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gay-lussac's law

gay-lussac's law

##### 1 Answer

0.91 atm

#### Explanation:

At standard temperature and pressure ( **STP** ), the system has a temperature of 0 Celsius and pressure which is equal to the atmosphere, 1 atm.

A change in temperature causes a change in the pressure:

The volume of the gas remains constant at 200.0 mL, while its pressure and temperature changed. We will be able to calculate the pressure,

Before plugging in the values to the formula, we need to first convert the temperatures from Celsius to Kelvin:

Plugging in the values to find