What is the pressure in a 245 L tank that contains 5.21 kg of helium at 27 Celsius

(These are not rounded to the correct decimal)

130.94 atm

13,266.6 kPa

99,571.4 mmHg

Explanation:

PV = nRT

V = 245L

P = ?

R = 0.08206 (atm), 8.314 (kPa), 62.4 (mmHg)

T = 273.15 + 27 = 300.15K

n = 1302.5 moles

How I found (n).

5.21kg x 1000g/1kg x 1 mole/4.0g = 1302.5 moles

Now, plug all the numbers into the equation.

Pressure in atm = (1302.5) (0.08206) (300.15) / 245 = 130.94 atm (not rounded to the correct decimal)

Pressure in kPa = (1302.5) (8.314) (300.15) / 245 = 13,266.6 kPa (not rounded to the correct decimal)

Pressure in mmHg = (1302.5) (62.4) (300.15) / 245 = 99,571.4 mmHg (not rounded to the correct decimal)