# Problem: How many moles of Ar are contained in a 5.00 L tank at 155°C and 2.80 atm? A) 0.399 moles B) 0.455 moles C) 1.10 moles D) 2.51 moles E) 0.289 moles

###### FREE Expert Solution

Calculate the number of moles of gas present in the container using the ideal gas equation.

$\overline{){\mathbf{PV}}{\mathbf{=}}{\mathbf{nRT}}}$

P = pressure, atm
V = volume, L
n = moles, mol
R = gas constant = 0.08206 (L·atm)/(mol·K)
T = temperature, K

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###### Problem Details

How many moles of Ar are contained in a 5.00 L tank at 155°C and 2.80 atm?

A) 0.399 moles

B) 0.455 moles

C) 1.10 moles

D) 2.51 moles

E) 0.289 moles