Please solve q 43?

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Answer 1 · 2018-04-29T14:00:41

The answer is #option (2)#

The ideal gas equation is

#PV=nRT#

The number of moles is#n=m/M#

Therefore,

#PV=(m/M)RT#

#rho=m/V=(PM)/(RT)#

The density at #"STP is " 1.43gL^-1=1.43*10^3gm^-3#

STP is #{(T=273.15K),(P=101325 Pa):}#

The gas constant is

#R=8.3145J "mole"^-1K^-1#

Therefore,

#M=(rhoRT)/P=(1.43*10^3*8.3145*273.15)/(101325)#

The molecular weight is #=32g#

The answer is #option (2)#