Question

Breifly describe two methods one might use to find the molar mass of a newly synthesized gas for which a molecular formula was not known.

Answer 1

1). as we know the ideal gas law as

Where P=pressure in atm, V= volume of gas in litre , n= number of moles of gas, R=is the universal gas constant, and T is temperature in Kelvins.

Method 1st :)

if we know P, V, T then just plug in the values in equation

and find n then use the formula

Where m= mass of gas in gram, M is the molar mass of the unknown gas.

---

method 2)

IF the density of gas is say d is given then just put

S using

PUT and put so

we get finally

then its molar mass can be calculated using above relationship:

---

method 3rd):