Question

a 90 c y 1 atm el metanol es un gas cuya densidae es de 1,07 mg/ml determinar cual es la masa molecular
a que presion, manteniendo su temperatura constante, la densisad es la misma

Answer 1

T = 90 ºC + 273 = 363 K
P = 1 atm
d = 1.07 mg/mL

g/mL = 1.07 mg  x    1 g
           ````````````    `````````````
                1 mL     1000  mg

d = 0.00107 g/mL

R = 0.0821(L atm/mol K)

Ley de las gases ideales

P x V = n  x  R  x T

d = m/Mm ; n = m/Mm

P x  V  = m  x  R  x T
             ````
             Mm

P  x  Mm = m  x  R  x  T
                 `````
                   V
Mm = d x R x T
         ``````````````
                P

Mm = 1.07 g/L  x 0.0821 ( L atm / mol K) x 363 K
          ``````````````````````````````````````````````````````````
                                  1  atm

Mm = 32 g/mol del metanol