How many moles of a gas sample are in 2.5 L container at 373 K and 203 kPa?

1.11 moles

0.66 moles

0.33 moles

0.17 moles

Question

How many moles of a gas sample are in 2.5 L container at 373 K and 203 kPa?


       1.11 moles

       0.66 moles

       0.33 moles

       0.17 moles

jfraser · Answer

The Ideal Gas Law is most useful here:$$P*V = n * R * T$$ The value of R is$$R = 0.08205 \frac{L*atm}{mol*K}$$ Rearrange to solve for n$$n = \frac{P*V}{R*T}$$Since the units of R have atm in them, you need to convert the kPa to atm.$$230kPa * (\frac{1atm}{101.3kPa})$$plug and chug.