Which noble gas has a density of 1.79g/L at STP?
Answer:
Helium
chlorobenzene
bologna
at STP, 1 mol = 22.4L
so at 1.79g/L, multiply by 22.4 to get about 40.
so the answer is, with a molar mass of about 40, Argon.
I'm pretty sure it's not chlorobenzene (it's not a noble gas) and helium is probably not if this calculation is correct.
Use the equation
atomic mass = dRT/P
At STP, d is the density(g/L), R is the universal gas constant 0.08206 L atm / K mol, T is the STP temperature in Kelvin 273.15K, and P is the STP pressure of 1.00 atmospheres.
atomic mass = (1.79g/L)(0.08206)(273.15K) / (1.00 atm) = 40.1 g/mol
Argon has an atomic mass of 39.95 g/mol, so the correct answer would be argon.
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