Question

If the density of 4 M solution of KOH is 1.4 g then the molality of the solution will be (molecular mass of KOH = 56 u
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Answer 1

Answer:

The formula for molar concentration

c

is

c

=

moles

litres

Moles

=

5.6

g KOH

×

1 mol KOH

56.11

g KOH

=

0.0998 mol KOH

Litres

=

250

mL

×

1 L

1000

mL

=

0.2500 L

c

=

0.0998 mol

0.2500 L

=

0.40 mol/L

Answer 2

Answer:

250 cm3 = 0.25 dm3 (= 0.25 L ). For a solution, C=nV (concentration = number of moles/volume). Rearranging, n=CV=0.50×0.25=0.125 mol. We need 0.125 mol of ...

250 cm3 = 0.25 dm3 (= 0.25 L) For a solution, C=nV (concentration = number of moles/volume). Rearranging, n=CV=0.50×0.25=0.125 mol We need 0.125 mol