How many moles of propane (c3h8) are in a 7.00-l tank at 20.0°c and 5.45 atm of pressure?

Hey there!:

Temperature in kelvin :

20.0ºC + 273 => 293 K

R = 0.082

Volume =7.00 L

Pressure = 5.45 atm

Number of moles = ??

Therefe:

P * V = n * R * T

5.45 * 7.00 = n * 0.082 * 293

38.15 = n * 24,026

n = 38.15 / 24.026

n = 1.587 moles of propane ( C3H8 )

hope this helps!