Chemistry Question topscore

[whale86]

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Hey guys..

quick question, on topscore it says:

how much heat is needed to raise the temp of 160g of water from 18.8 degrees Celsius to 37 degrees Celsius. specific heat of water is 4.184 J/gC...

I know how to get the answer using the q=mct which gave me 12.2...

the part that im confused about is that I thought since the problem is using J/gC that the answer should be 12.2kJ. However, they have the correct answer being 12.2J (instead of kJ)....

not sure if im missing something 😕

if anyone can clear this for me id appreciate it...thanks 🙂

 

[CANgnome]

specific heat of water is 1kcal/kg
or 4200 kJ/kg
or 4200 J/g

 

[whale86]

im STILL confused?! 😕

 

[UCB05]

it's 1cal/gC, 1kcal/kgC, 4.2J/gC, 4.2kJ/kgC

OP, answer is a typo. It should be 12.2kJ

 

[whale86]

it's 1cal/gC, 1kcal/kgC, 4.2J/gC, 4.2kJ/kgC

OP, answer is a typo. It should be 12.2kJ

yeah i got 12.2kJ but according to TopScore the answer is 12.2J 😕

 

[sfoksn]

Yes, UCB is saying that TopScore's answer is a typo, and your answer is correct.

 

[whale86]

thanks 🙂