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![[Post New]](/templates/default/images/icon_minipost_new.gif) 8 May 2007 08:49:29 IST
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What is meant by water equivqlent of a caloriemeter? When 400 gm of water at 30 C is mixed with 150 gm of water at 25 C contained in a caloriemeter,the final temperature is found to be 27 C . Find the water equivalent of a caloriemeter in the same units.
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God has given you one face, and you
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~William Shakespeare
You were born an original. Don't die a copy.
~John Mason |
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8 May 2007 16:00:10 IST
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Water equivalent means that the amount of water that wud take up that much of heat as absorbed by the calorimeter!!!! This is an edited post this definiton is from a text book not my own as they wud be pathetic for xams but easy to comprehend!!! Now for the qs 0.4 * 4.2 * (30 - 27) = (0.15 ) * 4.2 * (27-25) + 2w Now u can solve for w = 1.89 I might have made some mistake here in calculation is ur answer 1.89 or 0.45!!!
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8 May 2007 16:21:16 IST
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Are you sure water equivalent means the thing you typed, or was it just a guess? what is 4.2 there? specific heat of water is 1
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God has given you one face, and you
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~William Shakespeare
You were born an original. Don't die a copy.
~John Mason |
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water equivalent of any substance means the amount of water having same heat capacity as that substance.
heat lost by water(hot)=400*1*3=1200 cal
heat gained by water(cold) and calorimeter=150*1*2+ms*2=300+2ms
now, 1200=300+2ms
2ms=900
ms=450 cal
i hope i m correct.rate me if u plz
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it is not important where u stand, but in which direction u are moving |
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9 May 2007 10:21:47 IST
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No it wasnt a guess my calculations r very bad!!!!that
's the problem!!!anyway 4.2 is in Joule/Kg C and i didnt do it in calories
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9 May 2007 10:27:33 IST
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so m i correct?
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it is not important where u stand, but in which direction u are moving |
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9 May 2007 10:32:32 IST
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yes u r answer is in differen tunits than mine but in essence its the same i by mistake multipiled twice in the firast case and got 1.89 its is 0.45 or 450 as ramyani stated!!!Darn my calculations!!!
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9 May 2007 11:09:02 IST
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Thank you both of u are correct, Taruntanuj you shd read the question carefully, the question requires the answer in same units and also be careful with the calculations
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God has given you one face, and you
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~William Shakespeare
You were born an original. Don't die a copy.
~John Mason |
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10 May 2007 05:51:52 IST
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Taruntanuji u r not correct...............because in the same step u have taken different values for the specific heat of water-as 4.2
and 1................but the other girl is right..........girls nowadays prove better
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