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Nady [450]
3 years ago
11

The Nusselt number is defined as Nu = _____ where Lc is the characteristic length of the surface, h is the convective heat trans

fer coefficient, and k is the thermal conductivity of the fluid.
Chemistry
1 answer:
irakobra [83]3 years ago
3 0

Answer: Nu = h Lc ÷ k

Explanation: The Nusselt number (Nu) can be defined as the ratio of convective to conductive heat transfer at a boundary in a fluid.

Nu =  Convective Heat Transfer               h Lc

          --------------------------------------     =      ---------

         Conductive Heat Transfer                  k

Where h  = conductive hear transfer

           Lc = length of the surface

           k   = thermal conductivity of the fluid

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Explanation:

Step 1: Data given

Mass of lauryl alcohol = 8.80 grams

Mass of benzene = 0.100 kg = 100 grams

Freezing point of Benzene is 5.5 °C

Kf value for benzene = 5.12 °C/molal

Step 2: Calculate the freezing point depression

ΔTf = 5.5 - 3.0 °C = 2.5 °C

Step 3: Calculate molality

⇒ with ΔTf = the freezing point depression = 2.5 °C

⇒ with i = the van't Hoff factor = 1

⇒ with kf = the free point depression constat pf benzene = 5.12°C/m

⇒ with m =the molality = TO BE DETERMINED

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molality =  0.488 molal

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Molality = moles lauryl alcohol / mass benzene

Moles lauryl alcohol = molality * mass benzene

Moles lauryl alcohol = 0.488 m * 0.100 kg

Moles lauryl alcohol = 0.0488 moles

Step 5: Calculate molar mass of lauryl alcohol

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Molar mass lauryl alcohol = 8.80 grams / 0.0488 moles

Molar mass lauryl alcohol = 180 g/mol

The molar mass of lauryl alcohol is approximately 180 g/mol

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