Select one correct statement. In the gas equation, PV \( =\mathrm{nRT} \)(1) \( \mathrm{n} \) is...

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Select one correct statement. In the gas equation, PV \( =\mathrm{nRT} \)(1) \( \mathrm{n} \) is the number of molecules of a gas(2) V denotes volume of one mole of the gas(3) n moles of the gas have a volume \( V \)(4) P is the pressure of the gas when only one mole of gas is present
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