A sample of 10 g of liquid benzene at its boiling point is vaporised using a 12 V,0.5 A electric supply. The normal boiling point and latent heat of vaporisation of benzene are353.2 K and 30.8 * 103 kJ/kmol respectively. Determine: (a) the change in internal energy, (b)the time required for complete vaporisation.A vessel of volume 1 m3 initially contains one per cent by volume saturated liquid water andthe rest saturated vapour at 1 bar. How much heat is to be supplied so that the vessel gets filledwith vapour? Take data from steam tables.Liquid water at 373 K and 101.3 kPa has an internal energy of 420 kJ/kg on an arbitrary basis.The specific volume at these conditions is 1.04 * 10– 3 m3/kg. The water is brought to thevapour state at 473 K and 700 kPa. At this condition, its specific volume is0.3 m3/kg and its enthalpy is 2844 kJ/kg. Calculate the enthalpy of the liquid and the changes ininternal energy and enthalpy accompanying the vaporisation process.

As it is not mentioned which question to solve, we are solving the first one. (a) The change in…

Answered: A sample of 10 g of liquid benzene at…

Introduction to Chemical Engineering Thermodynamics

8th Edition

ISBN:9781259696527

Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Chapter1: Introduction

Section: Chapter Questions

Problem 1.1P

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A sample of 10 g of liquid benzene at its boiling point is vaporised using a 12 V,
0.5 A electric supply. The normal boiling point and latent heat of vaporisation of benzene are
353.2 K and 30.8 * 10
3 kJ/kmol respectively. Determine: (a) the change in internal energy, (b)
the time required for complete vaporisation.
A vessel of volume 1 m3 initially contains one per cent by volume saturated liquid water and
the rest saturated vapour at 1 bar. How much heat is to be supplied so that the vessel gets filled
with vapour? Take data from steam tables.
Liquid water at 373 K and 101.3 kPa has an internal energy of 420 kJ/kg on an arbitrary basis.
The specific volume at these conditions is 1.04 * 10
– 3 m3/kg. The water is brought to the
vapour state at 473 K and 700 kPa. At this condition, its specific volume is
0.3 m3/kg and its enthalpy is 2844 kJ/kg. Calculate the enthalpy of the liquid and the changes in
internal energy and enthalpy accompanying the vaporisation process.

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