Help with chemistry?

Question

A 500 mL sample of a gas at 507 torr and 97 degrees Celcius has a mass of 0.966g. What is the gas?

Answer 1

I will explain how to solve this, but you do the conversions and the math.  Assuming ideal gas behavior,

 

PV = nRT

 

P = pressure (given)

V = volume (given)

T = temperature (given)

R = universal gas constant (look it up in your chemistry book)

n = number of moles = mass/molecular weight

 

n = PV/(RT)

 

Convert the units of P and V to units compatible with the units of R, and convert T to Kelvins.  Compute n from

 

n = PV/(RT)

 

You know the mass m of the gas (given).  Compute the molecular weight W of the gas from

 

n = m/W ⇒

 

W = m/n

 

Once you have W, find a table of molecular weights and see which gas has the same molecular weight that you calculated.