How much heat in joules is needed to raise the temperature

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Homework Help Overview

The problem involves calculating the amount of heat in joules required to raise the temperature of a specific volume of water from one temperature to another, specifically focusing on 7.0 L of water being heated from 0°C to 78.0°C.

Discussion Character

  • Exploratory, Mathematical reasoning, Assumption checking

Approaches and Questions Raised

  • Participants discuss the calculations involved in determining the heat required, with one participant providing a detailed attempt at the solution using specific heat capacity and conversion factors. Others question the accuracy of the initial answer and seek clarification on the calculations.

Discussion Status

The discussion includes attempts to verify calculations and clarify misunderstandings. One participant acknowledges an error in their previous answer, while others are engaged in exploring the reasoning behind the calculations. There is an ongoing exchange of ideas without a definitive consensus on the approach.

Contextual Notes

Participants note variations in the volume of water in the problem statement, which may lead to confusion regarding the calculations. The original definition of a liter is mentioned as a hint, suggesting a focus on units and conversions.

comoore
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Homework Statement


How much heat in joules is needed to raise the temperature of 7.0 L of water from 0°C to 78.0°C? (Hint: Recall the original definition of the liter.)

Homework Equations


How much heat in joules is needed to raise the temperature of 7.5 L of water from 0°C to 87.0°C? (Hint: Recall the original definition of the liter.)
2.73e+06 J

The Attempt at a Solution


I answered 2.28^06 J.
I have actually already asked this question on another forum, and they couldn't figure it out either. Please help.
 
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I think so...

I did 7000 gm x 78 C=546000 calories
546000x4.184j/calorie=2284.5 kj
Then converted kj to j
 
OH. MY. GOSH. I didn't put the 10 in when I answered. The answer is correct. 2.28x10^6 J.
 
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comoore said:
7.0 L of water
comoore said:
7.5 L of water
Better turn off the tap.
 
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