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How many molecules are in 30 liters of methane (CH4) at STP?

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Get moles with ideal gas equation first.


PV = nRT

(1 atm)(30 Liters) = n(0.08206 L*atm/mol*K)(298.15 K)


= 30/24.466 = moles methane


= 1.226 moles methane



1.226 mole methane (6.022 X 10^23/1 mole CH4)


= 7.4 X 10^23 molecules of methane


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