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?
The molecular weight (molar mass) in g/mol is
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
moles of gas
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