# What is the mass of 7.0 L of hydrogen gas?

##### 1 Answer

In order to determine the mass of any gas you need the set of paramaters that describe that gas - pressure, volume, temperature and/or moles. If values are given for these paramaters, you could use the ideal gas law,

If you are dealing with **STP** conditions, which I assume is the case here, remember that in this case pressure is equal to **1.00 atm** and temperature is equal to **273.15K**. So,

Since we know hydrogen's molar mass (

If indeed you are dealing with **STP**, remember that, under these conditions, 1 mole of **any ideal gas** occupies

And, once again,