Respuesta :

Willchemistry
By the claperyron equation:

T = 20.0ºC + 273.15 => 293.15 K

R = 0.082 atm

Therefore:

P x V = n x R x T

5.45 x 7.00 = n x 0.082 x 293.15 

38.15 = n x 24.0383

n = 38.15 / 24.0383

n = 1.587 moles of C3H8