Chemistry identify monoatomic gas?! help!
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Chemistry identify monoatomic gas?! help!

[From: ] [author: ] [Date: 11-09-11] [Hit: ]
and the Volume is 50L, and Tank 3 has 671 grams of unknown substance.This is the question, it is not relevant to another part of the question, it is its own question. I am just confused on how to find the answer.......
The pressure gauge on Tank #3 reads 2.50 atm. What is the identity of the monatomic gas in Tank #3? The temperature is 25C, and the Volume is 50L, and Tank 3 has 671 grams of unknown substance.

This is the question, it is not relevant to another part of the question, it is it's own question. I am just confused on how to find the answer. Can someone please help me set up this problem? Thanks!

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First, use PV=nRT to calculate the number of moles, n, in the tank.

n = PV/RT

n = (2.50 atm)(50 L) / ( 0.082057 L atm/mol K)(298 K)

n = 5.11 mol

Second, use the given mass and n to calculate the molar mass of the gas.

671 g / 5.11 mol = 131 g/mol

Third, determine which element matches this molar mass.

Since 131 is very close to the atomic mass of Xe, Xe is the unknown gas.
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