# If a 0.614 g sample of a gas maintains a pressure of 238 mm Hg when contained in a 1.0L flask at 0.0°C, what is the gases molecular weight?

##### 1 Answer

#### Answer:

The molecular weight (molar mass) in g/mol is

#### Explanation:

We first need to use the ideal gas law to determine the moles of the gas. Then we will divide the given mass by the calculated moles.

The equation for the ideal gas law is

**Given**

https://en.wikipedia.org/wiki/Gas_constant

**Unknown**

moles of gas

**Solution**

Rearrange the equation for the ideal gas law to isolate

Determine molecular weight in g/mol by dividing the given mass by the calculated moles.

This could be carbon dioxide gas, as it has a molar mass of