Question

To identify a diatomic gas (X2), a researcher carried out the following experiment: She weighed an empty 2.8-L bulb, then filled it with the gas at 2.01 bar and 29.0 ∘C and weighed it again. The difference in mass was 6.3 g . Identify the gas.

I found the moles and I got 0.244 moles but i'm not sure what to do next...

Answer 1

@Jhannybean

Answer 2

Usually the only way we can determine the gas in this type of a question is to find the molar mass of the diatomic gas.
Use
n= m /M
moles = mass divided by molar mass
She weighed the bulb alone and weighed it with the gas in , the difference of those gives you the mass of the gas.
So now we know the mass of the gas and the no. of moles .
Subject " molar mass"
molar mass = mass/ moles
Now get the answer.
a diatomic gas is made up of 2 similar elements.
When u divide the molar mass by 2 u can get the molar mass of the element in this diatomic gas. Then obviously you can find the element.