Molar Heat of Combustion (1 Viewer)

[JaxsenW]

Could someone please help with this question?
I have an answer, but no way to check if it is correct,
Thanks.

Mass of 1-Propanol burnt- 0.60g
Mass of water heated- 200g
Initial temp of the water- 21.0°c

The molar heat of combustion of 1-propanol is 2021kJ.Mol^-1. Assuming no heat loss, what would be the final temperature of the water?

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[ichila101]

Could someone please help with this question?
I have an answer, but no way to check if it is correct,
Thanks.

Mass of 1-Propanol burnt- 0.60g
Mass of water heated- 200g
Initial temp of the water- 21.0°c

The molar heat of combustion of 1-propanol is 2021kJ.Mol^-1. Assuming no heat loss, what would be the final temperature of the water?

Sent from my SM-G935F using Tapatalk

45.1 degrees Celcius

 

[ichila101]

Did you want working out as well or just the answer?

 

[JaxsenW]

Working would be great, I got 45.137, not sure where the small discrepancy is?
Thanks

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[JaxsenW]

Did you want working out as well or just the answer?

Oh never mind, you just changed it to 45.1 as opposed to 45.2
All good haha
Thanks!

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[ichila101]

Working would be great, I got 45.137, not sure where the small discrepancy is?
Thanks

Sent from my SM-G935F using Tapatalk

Just sending the working in any case, iirc, for adding or subtracting it is least number of decimal places and for multiplying or dividing its least number of significant figures. Since the last step was adding 21.0 the final temp will be to 1 decimal place rounded down of course (that .2 was a mistake sorry about that)