Hellmann, zelles, palojarvi, and bai published a paper in 1997 about extracting lipids from organic material. they reported using a mixture that was 85% n-hexane and 15 % dichloromethane (vol/vol). what is the mole fraction of each compound in the mixture? what is the mass fraction of each compound in the mixture? skills: unit conversions, choosing a temporary basis

Mass fraction: 73,6% n-hexane; 26,4% dichloromethane

Mole fraction: 73,0% n-hexane; 27,0% dichloromethane

Explanation:

With a basis of 100 mL:

Mass of n-hexane:

85 mL × = 55,7 g

Mass of dichloromethane

15 mL × = 20,0 g

Total mass = 20,0 g + 55,7 g = 75,7 g

Mass fraction of n-hexane:

=73,6%

Mass fraction of dichloromethane:

= 26,4%

Moles of n-hexane:

55,7 g × = 0,65 moles

Mass of dichloromethane

20,0g × = 0,24 moles

Total moles: 0,65 moles + 0,24 moles = 0,89 moles

Molar fraction of n-hexane:

=73,0%

Molar fraction of dichloromethane:

= 27,0%

I hope it helps!

hloride, what is the mass of calcium in

explanation:

hurricanes form when warm, moist air from the ocean surface quickly rises into the atmosphere and forms storm clouds and rain. when the clouds are formed, heat is released which warms the cool air in the upper regions of the atmosphere so that the cycle can continue. which two phases of the water cycle are repeated in this process?