Grade 11Physical Chemistry
H2SO4 solution is 500 molal. (density = 1.8 g/mL).Hence its molarity is(a) 18M(b) 36M(c) 9M (d) 4.50M
H2SO4 solution is 500 molal. (density = 1.8 g/mL).Hence its molarity is
(a) 18M
(b) 36M
(c) 9M
(d) 4.50M
1 Answer
Vikas TU
We know that,
molarity=no. of moles ofsolute/vol of soln. in litre
andmolality=no. of moles of solute/ wt. of solvent.
Dividing both we get the relation as:
M/m = wt. of solvent/vol. of soln.
Further elaborating we get ,
molality= Molarity/(density of solution-Molarity*molecular wt of solute)
m = M / (ρ - M x mw A)
Putting the values,
M = m*(ρ - M x mw A)
M = 500*(1.8 – M*98)
M = 900 – 49000M
49001M = 900
M = 900/49001 => 0.0183 *1000 => 18.3 approx.
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