Thermodynamics: Solving for Initial Temperature of Copper in Ethanol Solution

  • Thread starter Thread starter eliassiguenza
  • Start date Start date
  • Tags Tags
    Thermodynamics
AI Thread Summary
The discussion revolves around a calorimetry problem involving the heat exchange between aluminum, copper, and ethanol. The initial temperatures and specific heat capacities are used to calculate the heat transfer, with the final temperature of the system being 28 degrees Celsius. Participants suggest balancing the heat lost by aluminum and copper with the heat gained by ethanol to find the initial temperature of copper. The calculations for the heat transfer for each component are being performed, and the approach appears to be on the right track. Overall, the focus is on applying the correct thermodynamic equations to solve for the unknown initial temperature of copper.
eliassiguenza
Messages
24
Reaction score
0

Homework Statement


11 grams of Aluminium at 200 degrees Celsius and 19 grans of Copper are dropped into 49 cubic centimetres of ethanol at 15 Degrees Celsius, The temperature Quickly becomes 28 Deegres Celsuis.

What was the initial temperature of copper?

Homework Equations



Q= c dT

The Attempt at a Solution



I am very lost.. please help
 
Physics news on Phys.org
This is a calorimetry problem.

Cast your formula in the following form: Q = m cp (Tf - To). Balance heat loss and heat gained by all the components. And note all materials will have the same Tf.
 
ok so what i did was to find Q value for Ethanol and Aluminium

Ethanol density = .79 g/ cm3 in 49 cm3 = 0.0387 kg
Q Al = 0.011kg * (900 J /kg K) * (473.15K - 301.15K)
Q Eth= 0.0387kg (2400J/kg K) * (301.15K- 288.15K)
Q Cu = 0.019kg * (385 j /Kg K) * (301.15 - ?)

am I going well ?
 
Looks good so far.
 
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
View full post »

Thread 'Struggling to understand the concept of this question (ice cube in water optics question)'

TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
View full post »

Similar threads

When to convert units of temperature?
Replies
2
Views
2K
What is the Maximum Temperature for a Copper Block at 1000 atm Pressure?
Replies
3
Views
3K
What is the final temperature of the mixture?
Replies
2
Views
2K
Thermodynamics Gas Mixture - Dew Point Temperature
Replies
4
Views
3K
Why did my water contract when exposed to rapid temperature change?
Replies
7
Views
2K
Thermodynamics - Temperature change of Argon
Replies
19
Views
3K
Thermodynamics question: temperature between layers
Replies
3
Views
1K
Specific Heat (kCal and J) for copper, help please
Replies
1
Views
3K
What was the initial temperature of the copper?
Replies
4
Views
3K
Finding Initial Temperature Entropy and Heat Exchange
Replies
1
Views
2K

Hot Threads

Recent Insights

Back
Top