Question

The atmosphere on the planet Venus exerts a pressure of 90.0 atm at the surface, at a temperature of 900 degrees F. If an interplanetary vehicle goes to Venus and collects 2.50L of this gas and brings it back to Earth, what volume would the gas occupy at STP?

Answer 1

first calculate mole of gas by using ideal gas equation

Ideal gas equation

PV = nRT             where, P = atm pressure= 90 atm,

V = volume in Liter = 2.50 L

n = number of mole = ?

R = 0.08205L atm mol^-1 K^-1 =Proportionality constant = gas constant,

T = Temperature in K = 900⁰F = 755.372 K

We can write ideal gas equation

n = PV/RT

Substitute the value

n = (90 2.50)/(0.08205 755.372) = 3.63 mole

at STP 1 mole of gas occupy volume 22.414 L then 3.63 mole occupy volume

22.414 3.63 = 81.36 L

at STP gas occupy volume 81.36 L