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Accepted values for the latent heat of fusion Discussion of the latent heat of fusion

stephanieyoong

Posted 30 April 2005 - 08:36 AM

I was wondering if i re arranged this equation right or I totally made it up...

Cw= 4.2*10^3JKgK
Mi= 0.03296Kg
Ts= 3.10c
Lf=?

total heat gained=Mi Lf + Mi Cw (T2 - 0)
=(0.0329)Lf + (0.3296)(4.2*10^3)(3.10-0)
=(0.0329)Lf = 429.14
0.03296Lf = 429.14
Lf = 130 20
therefore.gif Lf = 1.30*10^4JKg-1

Can answer the question like that even though I dont know total heat gained? If i did it wrong can someone tell me the right way to do it pleasssssseee!!!

sweatingbullets.gif thank u!!

stephanieyoong

Posted 30 April 2005 - 12:00 PM

Whats the accepted value of the latent heat of fusion of ice?? is it the same as water??

werlop

Posted 30 April 2005 - 12:43 PM

The specific latent heat of fusion of ice at 0 ºC, is 334 KJkg -1 . This means that to convert 1 kg of ice at 0ºC to 1 kg of water at 0 ºC, 334 kJ of heat must be absorbed by the ice. Conversely, when 1 kg of water at 0 ºC freezes to give 1 kg of ice at 0 ºC, 334 kJ of heat will be released to the surroundings.

werlop

Posted 30 April 2005 - 12:46 PM

Could you write down the question in full please?

stephanieyoong

Posted 30 April 2005 - 12:47 PM

Thank you!! life saver! i was lookin it up n onli got stuff on how to find it ^^ cheers

werlop

Posted 30 April 2005 - 12:50 PM

No probs, it is in the front of all the advnaced higher physics exams on the data sheet, although that looks like your doing standard grade to me? I could only find water on the data sheet for standard grade which is the same as ice anyway.

Dave

Posted 30 April 2005 - 07:02 PM

She from perth though......Australia devision tongue.gif

stephanieyoong

Posted 01 May 2005 - 04:43 AM

The expression for the total heat gained by ice melting and the ice being raised to the final temperature T2, is

total heat gained=Mi Lf + Mi Cw (T2 - 0)
Where specifice heat of water is (Cw)= 4.2 X 10^3Jkg-1K-1

data
Cw= 4.2*10^3JKgK
Mi= 0.03296Kg
Ts= 3.10c
Lf=?
Q=?


stephanieyoong

Posted 01 May 2005 - 04:47 AM

lol *shakes fist* Aust is good!! Hmm in my physics book it says the latent heat of water is 3.34x10^5Jkg

wats standard grade is it like high school? im in my second final yr of high skool XD arghhhhh exams!!!!!!! btw this site is good keep up da good work!

Dave

Posted 01 May 2005 - 10:05 AM

i was just reminding werlop that you wont be doing standard grades, higher and advanced highers

stangards are done in your 4 year of high school here, these are your lowest and 1st set of exams. On your 5th year you can do highers and these are the subjects that you can use to get into university. Sometimes you can alos do advanced highers the year after to get extra more advanced work which will be of advantage in university

stephanieyoong

Posted 01 May 2005 - 11:18 AM

ahh icic so im standard ^^ i think....

Dave

Posted 01 May 2005 - 11:28 AM

well your sitting exams at 15..i think, which i certainly didnt do ( was 16) but yeah i would hope its standard grades (equililant) although your questions are quite advanced

stephanieyoong

Posted 01 May 2005 - 11:59 AM

well im born at dec so im 16 this year..i had exams last yr ehhe did hell good in english n passed math..sleep.gif' but they wer sorta mock exams 4 nex yr so were pre pared

dfx

Posted 01 May 2005 - 07:53 PM

is this in the Higher Physics coursse? ohmy.gif

Dave

Posted 01 May 2005 - 08:54 PM

no...simple answer

stephanieyoong

Posted 02 May 2005 - 08:51 AM

?? then wat course is it?? hmm anyone no if its right?? help!

Dave

Posted 02 May 2005 - 09:38 AM

See not i am comfused

You are not sitting SQA higher physics are you

The last time i did higher physics i was pretty sure that wasnt in it and m know its not in advanced higher

stephanieyoong

Posted 02 May 2005 - 09:43 AM

hmm its cause im in AUST! lol umm well im 2yrs away from uni and im 16 so go figure?? but yeah bak to the original quest is it right??

Dave

Posted 02 May 2005 - 09:50 AM

difficult to tell because i have never done it but it seems to be a correct logic and such

stephanieyoong

Posted 02 May 2005 - 01:21 PM

ahh icic hmm but can u solve an equation wif 2 unkowns?

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