Calculating Heat Needed to Raise Water Temperature from 8.2◦C to 73◦C

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In summary, the conversation discusses how to calculate the amount of heat needed to raise the temperature of 62 g of water from 8.2◦C to 73◦C, using the specific heat of water. The correct answer is 16,794 J.
  • #1
DrMcDreamy
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Homework Statement



This is for my physics homework and I haven't done gen chem in a while so I was wondering if this was right:

You need to raise the temperature of 62 g of water from 8.2◦C to 73◦C. How much heat is needed to accomplish this? The specific heat of water is 4180 J/kg ·◦C. Answer in units of J.

Homework Equations



Q=mc[tex]\Delta[/tex]T

The Attempt at a Solution



Q=(0.062 kg)(4180 J/kg◦C)(73◦C-8.2◦C) = 16,793.568 J

Is that right? TIA
 
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  • #2
Correct approach, again problem with SD. Answering 17 kJ, or 16.8 kJ will do.
 
  • #3
Thank you! I put in 16,794 and it was right.
 

FAQ: Calculating Heat Needed to Raise Water Temperature from 8.2◦C to 73◦C

How is heat measured?

Heat is measured in units of energy, such as joules or calories. In scientific terms, heat is defined as the transfer of energy from one object to another due to a difference in temperature.

What is the specific heat capacity of a substance?

The specific heat capacity of a substance is the amount of heat required to raise the temperature of one gram of that substance by one degree Celsius. Each substance has a unique specific heat capacity, which is dependent on its physical and chemical properties.

How does heat transfer occur?

Heat transfer can occur through three main mechanisms: conduction, convection, and radiation. Conduction is the transfer of heat through direct contact between two objects. Convection is the transfer of heat through the movement of fluids (such as air or water). Radiation is the transfer of heat through electromagnetic waves.

What factors affect the amount of heat needed to raise the temperature of a substance?

The amount of heat needed to raise the temperature of a substance depends on factors such as the substance's mass, specific heat capacity, and initial and final temperatures. Additionally, the type of heat transfer (conduction, convection, or radiation) and any external influences (such as insulation or external heat sources) can also affect the amount of heat needed.

How can heat be calculated?

Heat can be calculated using the formula Q = m x c x ∆T, where Q is the amount of heat transferred, m is the mass of the substance, c is the specific heat capacity, and ∆T is the change in temperature. This formula can be applied to various scenarios, such as determining the amount of heat needed to raise the temperature of a substance or calculating the amount of heat transferred during a specific heat transfer process.

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