Calculate change of entropy of universe:

5Kg of ice at 100C is kept in atmosphere that is at 30⁰C. Calculate change of entropy of universe when it melts and comes into thermal equilibrium with atmosphere. Take latent heat of fusion as 335KJ/kg and specific Heat of ice is half of that of water.                                                                                                                                    

Sol: Mass of ice, m = 5Kg

Temperature of ice = -100C = 263K Temperature of atmosphere = 300C = 303K

Heat absorbed by ice from the atmosphere = Heat in solid phase + latent heat + heat in liquid phase

= m_iC_idT + M_iL_i + m_wC_wdT

= 5 × 4.187/2 ( 0 + 10) + 5 × 335 + 5 × 4.187 × ( 30 - 0)

= 104.675 + 1675 + 628.05

Q = 2407.725KJ

Entropy change of atmosphere ( ? s)atm  = - Q/T =  -2407.725/303

(?s)_atm   = - 7.946KJ/k

Entropy change of ice(?s)_ice

= Entropy change as ice gets heated from - 10⁰C to 0⁰C + Entropy change as ice melts at 0⁰C to water at 0⁰C + Entropy change of water as it gets heated from 0⁰C to 30⁰C

 

= 5 x 1.7409 = 8.705KJ

Entropy of universe = Entropy change of atmosphere (?s)_atm  + Entropy change of ice( ? s)_ice

= - 7.946KJ/k  + 8.705KJ

= 0.7605329KJ/kg                            .......ANS

 

Posted Date: 10/16/2012 6:42:50 AM | Location : United States

Ask an Expert

Related Discussions:- Calculate change of entropy of universe, Assignment Help, Ask Question on Calculate change of entropy of universe, Get Answer, Expert's Help, Calculate change of entropy of universe Discussions

Write discussion on Calculate change of entropy of universe
Your posts are moderated

Write your message here..

Related Questions

Explain the working of die casting, Q. Explain the working of Die Casting? ... Q. Explain the working of Die Casting? In the die casting process the, mould used for a casting is permanent called a die casting. it is shown in figure. It is thus quite diffe

Relative motion, the jet transport B is flying at the velocity of 600km/h w... the jet transport B is flying at the velocity of 600km/h when a smaller aircraft A passes underneath the transport headed in the 60 degree direction. To passengers in B, however ap

Moment of intertia, define moment of inertia define moment of inertia

The dimension text edit command-autocad, The Dimension Text Edit command is... The Dimension Text Edit command is used to modify the text position of any single dimension.                                    The command can be used to position the tex

Numerical problems based on overhanging beam, Numerica l Problems Based on... Numerica l Problems Based on Overhanging Beam: Q: Draw Shear force diagram for the simply supported beam loaded as shown in the figure given below. Sol.: Let the

Fermentation choices - fermenter, In considering a particular fermentation ... In considering a particular fermentation there are a number of choices regarding process operation. Typical  initial considerations are listed below. Again, the choices made will d

Block''s acceleration, A block whose weight is 36.0 N rests on a horizontal... A block whose weight is 36.0 N rests on a horizontal table. A horizontal force of 35 N is applied to the block. The coefficients of static & kinetic friction are 0.650 and 0.420, r

Design a soda vending machine, Design a soda vending machine that can deliv... Design a soda vending machine that can deliver three kinds of soda, A, B and C. All the three soda cost the same amount - 70 cents. The vending machine has four coin slots, one eac

Stone slab culverts with abutments, Stone Slab Culverts with Abutments and ... Stone Slab Culverts with Abutments and Piers: Where good quality stone slabs are available like granite slabs, they can be used for superstructure of culverts, with suitable

Define flavorings in iges, Define Flavorings in IGES Flavorings : IGE... Define Flavorings in IGES Flavorings : IGES contained several ways to capture the same information, which made proper interpretation largely dependent on the particular  "fla