please answer with explanation and proper steps
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0.0196 is the answer
but according to the approximated formula(which everyone use) it is 0.2
i meant 0.02....sorry
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Number of moles of solute(urea) = n₁ = 6/60 = 0.1
Number of moles of solvent(water) = n₂ = 90/18 = 5
Relative lowering of vapour pressure = mole fraction of solute
= n₁/(n₁ +n₂)
but when n₁<<<<<n₂ as in this case
Relative lowering of vapour pressure is approximated as n₁/n₂
= 0.1/5
= 0.02
Hope u get helped by it
Number of moles of solvent(water) = n₂ = 90/18 = 5
Relative lowering of vapour pressure = mole fraction of solute
= n₁/(n₁ +n₂)
but when n₁<<<<<n₂ as in this case
Relative lowering of vapour pressure is approximated as n₁/n₂
= 0.1/5
= 0.02
Hope u get helped by it
i agree with you but both are there in options
so
the one without approximations is correct
.i.e, 0.0196
yeah but 0.1 / 5 gives you 0.02 then how 0.0196
look i approximated n1/(n1 +n2) as n1/n2 because n1=0.1 is very small
and if hadn't done that then the answer would be n1/(n1 + n2) = 0.1/5.1
then 0.1/5.1 would give the answer 0.0196
got it?
thanks
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