catboy4755 catboy4755

19-10-2018
Chemistry

contestada

What molality of pentane is obtained by dissolving 15 g pentane, c5h12, in 245.0 g hexane, c6h14?

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organicstars801 organicstars801

28-10-2018

Answer

The molality of pentane will be be 0.84 Molality

Data given

mass of pentane = 15g
molar mass of pentane = 72.15
mass of solvent (hexane) = 245.0 g = 0.245 Kg

Solution

Molality = (given mass ÷ molar mass ) ÷ 1 Kg of solvent
Molality = ( 15 ÷ 72.15 ) ÷ 0.245 Kg
Molality = 0.84

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