Question

find the mole fraction of 5.2 molal CH3OH solution.

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Answer 1

hey dear

here is your answer

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As we know

Molal = Moles of solute ➗ mass of solvent

in unit kg

so according to question

it's given that ch3oh = 5.2 molal

5.2 molal is equal to 1kg mass of water

as we know density of water is 1000kg/m^3

in next step we calculate the mole of water in 1000g

so H2o is formula of water

we divide 1000 / 18.

molar weight of water is 18 gram

so 1000 / 18 = 55.55

so,

now we know that moles of water and solute
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Molal fraction of CH3OH =

mole of ch3oh ➗ ( mole of ch3oh + mole of h2o)

So,

given 5.2 ( mole of ch3oh)

given 55.55 ( mole of h2o)

then,

5.2 ➗ ( 5.2 + 55.55 )

5.2 ➗ ( 60.75 )

5.2 / 60.75

= 0.08

hence the mole of fraction is 0.08

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hope it helps

thank you