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# How many moles of gas does the cylinder contain? ?

A cylinder contains 11.0 L of air at a total pressure of 42.8 psi and a temperature of 30 ∘C.

How many moles of gas does the cylinder contain?

### 1 Answer

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- billrussell42Lv 72 months agoFavorite Answer
42.8 psi = 2.91 atm

assuming both are absolute

n = PV/RT = (2.91)(11) / (0.08206)(273.16+30) = _____ mol

Ideal gas law

PV = nRT

n = number of moles

R = gas constant = 0.08206 (atm∙L)/(mol∙K)

8.314 L∙kPa/mol∙K

0.08314 L∙bar/mol∙K

62.36 L∙torr/mol∙K

62.36 L∙mmHg/mol∙K

T = temperature in kelvins

P = absolute pressure in atm, kPa, bar, torr

V = volume in liters

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