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Dubai

Laws Of Thermodynamics

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Published in: Chemistry
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Thermodynamics and entropy

Hina N / Dubai

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Qualification: BS(HONS) chemistry,B.Ed,M.Ed

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  1. is the Stu Of {he relations between heat, work, temperature. and energy. O lempevr{uve Two sgsfemg in equilibrium Wiåh a fhird sggåem are in {hermal equilibrium with each other. s gecond Consetqqtion of Energy can change forms,but is neither created nor destroyed. *Ojai, equal enerqi.,} law = Entropy Of an isolated gygtem Entropy of a sgstem appro- always increases. HO —-7 COLD aches a constanf ag {empe- rature approaches absolute zero. The laws of {hercntdvnamics 'acts {he ener u, a sggfern change: can useful wot{ on
  2. is a measure of how much {he energw oc {he particles become more spread out in a process. O It ig also defined as the uan that expresses the degree of disorder a cystem. olf {he cgctem becomesless ordered,åhe entropy increases. If the sgstem becomes more ordered,khe entropy decreases. o Entropy is a measure of the heat {ransfer of energy Into a gggtem The (ollowing ate guides Idexflifgino, w'e,e-khev entropg de: teased. A. Nucnbec Microstate refers -to arrangement of the energy of each molecule in Mne whole system af one instant. it is directly rela±ecl {o amount of the cubsfance.The greater {he number of possi- ble microstates for a sgstem ,the (nigher the entropy. t. pnoses Gases have higher enitopy {ban liquids and liquids have higher entropy {han solids. C. The higher the higher is fie entropy. D. g;. Compared to a pure substance, in which all particles are entropiå of a mix\uce OF two or more different parficle types is greater. E. Dieso\ved substanc have higher entropy value than {heir corresponding
  3. Of'a A greater number of gas particle will increase {he entropg. consider following roach ion: Q H2Cg)f 2 H20(g) Three moles of gaseous combine- rnaV-.e moles of gaseous we. &Qecbc evocess ( esult O decrease entropy. The entropy change for a reaction can be by {awing the difference between the of -the standard en- {ropy values of {he products and {hose of the reactants-. ISO txn o ( products) • (reactants Whereuy, g entropy sigma '(sum of" Standard entropy of a cubstance indicating {hat standard entropy is determined under g\andard conditions Standard entropy is {he entropy a substance af and 1 otm of recgure. -the for

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