# A gas has a pressure of 699.0 mm Hg at 40.0°C. What is the temperature at standard pressure?

##### 1 Answer

The temperature will be

#### Explanation:

This is a pressure-temperature gas problem. This means that it involves Gay-Lussac's law, which states that the pressure of a given amount of a gas, held at constant volume, varies directly with its temperature. This means that if the pressure increases, so does the temperature, and vice-versa. The equation used to solve this problem is:

Before we go further, we need to determine what standard pressure is, and we need to convert the Celsius temperature to Kelvin temperature by adding

Standard pressure is

We need to convert

**Organize your data:**

**Known**

**Unknown**

**Solution**

Rearrange the equation above to isolate

If you need to convert the temperature in Kelvins back to the Celsius temperature, subtract