Question

use your textbook or other sources and find any constants and conversion factors you might need to evaluate the molar mass. Assume the pressure could be given in any one of the following units: inHg,cmHg,mmHg,torr,atm,or bar

Answer 1

mass of the substance = w grams

volume = V in litres

R = universa gas constant = R = 0.0821 L-atm / mol K

M = molar mass of the substance = g / mol

P should be in atm

form idela gas equation :

if pressure in atm

P V = w R T / M

M = w R T / P V -------------------------> 1

if pressure in inHg

inHg = 0.03342 atm

M = w R T / 0.03342 x P V

if pressure in cmHg

cmHg = 0.01316 atm

M = w R T / 0.01316 x P V

if pressure in mmHg

mmHg = 0.001316 atm

M = w R T / 0.001316 x P V

if pressure in torr

1torr = 0.001316 atm

M = w R T / 0.001316 x P V

if pressure in bar

1 bar = 0.9869 atm

M = w R T / 0.9869 x P V