Question

4. A sample of carbon monoxide (CO) has a volume of 3 L at 85 °C with a pressure of 157 kPa. Determine the number ofmoles of CO that are present in the sample

Answer 1

0.1583moles

Explanations:

According to ideal gas equation;

`PV=nRT`

where:

• P is the ,pressure, = 157kPa = 1.55atm

,

• V is the volume = 3L

,

• R is the Gas constant = 0.08205Latm/molK

,

• T is the temperature = 85 + 273 = 358K

Required

n is the number of moles

Substitute the given parameters

`\begin{gathered} n=(PV)/(RT) \\ n=(1.55*3)/(0.08205*358) \\ n=(4.65)/(29.3739) \\ n=0.1583moles \end{gathered}`

Hence the number of moles of CO that are present in the sample is 0.1583moles