A container has 21.5L of helium gas at a pressure of 245 kPa and a temperature
of 315K. How many moles of helium are in the container?

There are 2, 01 moles of helium in the container

Explanation:

We use the formula PV=nRT. We convert of pressure the unit kPa into atm:

101,325 kPa---1 atm

245   kPa   x= (245  kPa x 1 atm)/101,325 kPa=2,42 atm

PV= nRT  --->  n=PV/RT

n= 2, 42 atm x 21, 5 L/ 0,082 l atm /K mol  x315K

n=2, 012620871 mol

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