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ÇàÈô: ½ð±Ò+2, лл»ØÌû£¬ÐÁ¿àÀ² 2015-11-29 16:31:51
4¡¢£¨1£©Çó»ìºÏºóµÄζȣºµÈѹ¹ý³Ì£¬Q(·Å)=3*3.5R*(100-t)=Q(Îü)=1*4R*(t-0)£¬½âµÃ£ºt=72.41¡ãC,T=345.56K
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£¨4£©×ÜìØ ¦¤S=7.82-6.70+18.70=19.82J/K
2Â¥2015-11-29 13:35:17
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ÇàÈô: ½ð±Ò+1, лл»ØÌû 2015-11-29 16:31:59
stormtree93(±ùµã½µÎ´ú·¢): ½ð±Ò+5 2015-12-25 12:51:34
7¡¢£¨1£©ÏÈ×öÅжÏ200g 90¡ãCµÄË®£¬ÄÜ·ñ°Ñ200g 0¡ãCµÄ±ùÈÛ»¯£º
Q(·ÅÈÈ)=200*4.184*(90-0)=75312J
Q(ÎüÈÈ)=200*333.5=66700J
¾Ý´ËÅжϱù¿ÉÈ«²¿ÈÛ»¯£¬ÇÒ×îÖÕζÈΪ: Q=Q(·Å)-Q(Îü)=8612=400*4.184*(t-0)
t=5.14¡ãC  T=278.3K
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¦¤S£¨±ù£©=Qp/T+mCpln(T2/T1)=66700/273.15+200*4.184*ln(278.3/273.15)=259.82J/K
¦¤S£¨Ë®£©=mCpln(T2/T1)=200*4.184ln(278.3/363.15)=-222.69J/K
×ܦ¤S=259.82-222.69=37.13K
3Â¥2015-11-29 13:58:45
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stormtree93

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3Â¥: Originally posted by ¹ÈÖÐÃ÷ at 2015-11-29 13:58:45
7¡¢£¨1£©ÏÈ×öÅжÏ200g 90¡ãCµÄË®£¬ÄÜ·ñ°Ñ200g 0¡ãCµÄ±ùÈÛ»¯£º
Q(·ÅÈÈ)=200*4.184*(90-0)=75312J
Q(ÎüÈÈ)=200*333.5=66700J
¾Ý´ËÅжϱù¿ÉÈ«²¿ÈÛ»¯£¬ÇÒ×îÖÕζÈΪ: Q=Q(·Å)-Q(Îü)=8612=400*4.184*(t-0)
t=5.14¡ãC ...

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