Question

An unknown gas displaces 123ml of air at 1 atm and 27°c calculate the moles of gas collected.given that vapour pressure at 27°c is 19 cm of Hg

Answer 1

Answer:

P+a/Vm2 )(Vm-b) = RT [Van der waals equation of state] Vm-b ≈ Vm. Given Atomic masses : He = 4 u, O = 16 u. (Vrms) O2 = (Vrms) He. Vmpv = √(2RT/M) Vav = √(8RT/πM) The molecules are always in random motion and obey Newton's law of motion.