The molecular mass of a gas is 45 its density at stp is
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The molecular weight of a gas is 45. Its density at STP is
Options
(a) 22.4
(b) 11.2
(c) 5.7
(d) 2
Correct Answer:
2
Explanation:
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Anonymous:
Hlo
U r in which standard?
Answered by
7
From gas law,
PV= RT ..for 1 mole of gas..
we know Mass of gas = mol. weight×no of moles.. so for 1 mole, weight of gas = its mol. weight. so here weight of gas is 45g.
now divide both sides by M(mass). then u get
PM=dRT..(d=density)
Now at STP, P=1 atm, R=0.0821,T=273.15,M=45
solving the equation u get d =2 (approx)
PV= RT ..for 1 mole of gas..
we know Mass of gas = mol. weight×no of moles.. so for 1 mole, weight of gas = its mol. weight. so here weight of gas is 45g.
now divide both sides by M(mass). then u get
PM=dRT..(d=density)
Now at STP, P=1 atm, R=0.0821,T=273.15,M=45
solving the equation u get d =2 (approx)
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