Question

What is the volume of 6.23 moles of carbon dioxide at STP?

Answer 1

Of course this depends on how your syllabus defines STP. We might be given the molar volume at `"STP".`

Explanation:

The current definition prescribes a temperature of `273.15*K`, and a pressure of `1*"bar"`, `100*kPa`.

And we then use the Ideal Gas Equation to get our `"volume"` .

`V=(nRT)/P=(6.23*cancel(mol)xx8.314xx10^-2cancel((L*"bar")/(K^-1*mol^-1))xx273.15*cancelK)/(1*cancel"bar")` `=141*L`

Note that I chose the `R` constant appropriately.

Alternatively, sometimes the supplementary material in an exam gives the `"molar volume at STP"`, whatever standard they have used.