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एक कमरे में जिसकी धारिता `25.0m^(3)` है `27^(@)C` ताप और 1 atm दाब पर वायु के कुल अणुओं (जिनमें नाइट्रोजन, ऑक्‍सीजन, जालवाष्प और अन्य सभी अवयवों के कण सम्‍मिलित है) की संख्या ज्ञात कीजिए।

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आदर्श गैस समीकरण `PV=nKT` से अणुओं की संख्या
`n=(PV)/(kT)`
यहां `P=1` वायुमण्डजीय दाब `=1.01xx10^(5)Pa`
यहां `P=1` वायुमण्डलीय दाब `=1.01xx10^(5)Pa`
`T=27^(@)C=300K,V=25.0 "मीटर"^(3),k=1.38xx10^(-23)J//K`
`n=(1.01xx10^(5)xx25.0)/(1.38xx10^(-23)xx300)=6.10xx10^(26)`

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