If a sample container of CO2 (g), occupies a volume of 435 mL at a pressure of 0.987 atm and a temperature of 25 C. What is the volume of gas at STP?

The volume is 0,393 Liters (393 ml)

Explanation:

We use the formula PV=nRT. We clear n (number of moles). STP conditions are 1 atm pressure and 273 K temperature. The temperature in Kelvin= 25+273=298K. The volume in L: 435/1000= 0,435 L.

PV=nRT n=PV/RT n=(0,987 atmx0, 435 l)/(0,082 l atm/K mol x298K)

n=0,0176 mol

In conditions STP:

PV= nRT  V=(nRT)/P

V= 0,0176 mol x 0,082 l atm /K mol  / 1 atm = 0,393 L

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