Answer to Question #169992 in Chemistry for Jefferson Bure

Question

A 35L tank of oxygen is at 315K with an initial pressure of 190 atm. How many moles of gas does the tank contain?

Answer 1

P = 190 atm

V = 35 L

R = 0.0821 L atm mol^-1 K^-1

T = 315 K

n = unknown

Solution:

The Ideal Gas equation can be used (PV = nRT).

To find the number of moles of gas, solve the equation for n:

n = PV / RT

n = (190 atm × 35 L) / (0.0821 L atm mol^-1 K^-1 × 315 K) = 257.13899 mol = 257.14 mol

n = 257.14 mol

Answer: 257.14 moles of gas does the tank contain.