# How do you calculate the volume of 25.0 g of carbon monoxide at STP?

##### 1 Answer

The volume is 20.3 L.

#### Explanation:

We can convert the mass of carbon monoxide to moles and then use the Ideal Gas Law to calculate the volume at STP.

**Moles of #"CO"#**

**Volume at STP**

The Ideal Gas Law is:

#color(blue)(|bar(ul(PV = nRT)|)# ,

where

#P# is the pressure#V# is the volume#n# is the number of moles#R# is the gas constant#T# is the temperature

We can rearrange the Ideal Gas Law to get

#V = (nRT)/P#

STP is 1 bar and 0 °C.