09 First Law of Thermodynamics Tutorial

tem perature taking place in a given ©¥ength of tim e. tem perature is equal to that of the sur v o u n dings rather than m easuring the rise of S tate the advantage of m easuring the rate of rise of tem perature of the liquid w hen its(b) ©¥iquid. (a) D eterm ine a value for the specific heat capacity of the found to be increasing at the rate of 4 6 . 3 ¡¿ 1 0 - 3 K s - 1 . liquid w as equal to that of the surroundings, its va©¥ue w as 3 . 4 0 A and 1 2 . 2 V respective©¥y . W hen the tem perature of the 0 . 24 1 kg, a n d the am m eter and voltm eter readings iuere w as 1 0 7 1 K ' . T he m ass of liquid in the calorim eter w as the calorim eter, the heater, the stirT er and the therm om eter the specific heat capacity of a liquid. T he total heat capacity of T he figure show s the apparatus used in the determ ination ofS P 1 S e©¥f - P ractice Q uestio©¡ 5 6 S tate how the internal energy of a body is related to its tem perature. conse©¥vation of energy . 5 5 S tate the liisl law of lbem odynam ics and explain how it is an app©¥ication d the princip©¥e of (I) a system , Oi) an ideal gas. 5 4 E xp©¥ain what is m eant by the internal energy U of (ï©¥l) coolĺng effect accom panies evaporation. sam e substnnce, (©¥©¥) the epeclf©¥c latent heat of vaporisation ie higher than specific lateN heat of fu©¥lon ￠or the (©¥) m elting and boll©¥ng take place without a change in tem perature, 5 3 E xp©¥a©¥n, u s ing the klnetlc m odel of m atter, w hy (©¥) fus©¥on, (l©¥} vaporlzation . 5 2 D efine speclllc latent /©©oat, a n d oulline ttn m ain princlp©©e©¥ of ©©©¥©¥ delorm ln ¡¤ Ilon for (©¥) a B o©¥ld, {©¥©¥} a llquld 5 1 D efine s p e lieat capac? v, a n d oulline the m oln prlnd p©¥e©¥ ol ll©¥ delerm lnallon for ielļE thesk Q u T uto H a kX M . . «¶íÝéàê¬Ïáá¯P H V ©¥©¥C ©¥ D E P 几ñþÖõ×¢ËÝ树Öõ R A F R L ¡¤ IN A TITU TK ) N

2 (c) C alculate the total heat input in stage (i) . (b) D eterm ine the w ork done by the gas in stage (I) . pressure and volum e, (a) ©¥llustrate theses changes on a p - V diagram labelled w ith the appropriate values of extracted ©¥n this stage Is 6 3 1 , (i) cooled at constant volum e to the orlglnal tem perature of 3 0 0 K . T he heat (I) heated at constant pressure to 4 5 0 K , a n d then T he gas is then pressure of 1 . 0 ¡¿ 1 0 6 P a and tem perature of 3 0 0 K , S P 7 A cylinder fitted w ith a frictionless p©¥ston contains 5 , 0 ¡¿ 1 0 4 m a of an ideal gas at a rem ains the sam e even though m echanical work is done on the system . E xplain w hy, in the isotherm a©¥ com pression of an ¢®deal gas, the internal ener9 V (b) H ow is an isotherm a©¥ com pression of a gas achieved in practice? S P 6 (a) E xplain w hat is m eant by an isotherm al change. (c) the energy transferred to the gas by heat. (b) ' the increase in its internal energy and (a) the w ork done on the gas, A ssum ing that the gas is ideal, c a lculate S P 5 A 1 . 00 m ol sam ple of argon gas is heated at constant pressure