Energy Required to Change Water into Steam

AI Thread Summary
To convert one-quarter of 8.0 kg of water at 25°C into steam, the total energy required is calculated by first raising the temperature of all the water to 100°C and then converting 2.0 kg to steam. The specific heat capacity of water is 4200 J/kg°C, and the latent heat of vaporization is 2.3 x 10^6 J/kg. The total energy calculation yields Q total = 7.12 x 10^6 J. The approach taken in the calculations is confirmed to be correct. This demonstrates the energy requirements for phase changes in water.
Seinfeld4
Messages
21
Reaction score
0

Homework Statement



How much energy is required to change one-quarter of 8.0kg of water at 25 C into steam?

The way I see it, the entirety of the 8.0kg of water must be brought from 25 C to 100 C, then only 2.0kg is changed to steam so...

Specific heat capacity (of water) = 4200 J / kg C
Latent heat of vaporization (of water) = 2.3 * 10^6 J/kg

Q total = (8.0kg) (4200 J / kg C) (100-25) + (2.0kg) (2.3 * 10^6 J/kg)
Q total = 7.12 * 10^6 J

I'm not 100% sure if I'm doing this properly. Does this look correct?
 
Physics news on Phys.org
That looks correct to me!
 
Cool, thanks!
 

Thread 'Rolling without slipping on a curved surface'

Kindly see the attached pdf. My attempt to solve it, is in it. I'm wondering if my solution is right. My idea is this: At any point of time, the ball may be assumed to be at an incline which is at an angle of θ(kindly see both the pics in the pdf file). The value of θ will continuously change and so will the value of friction. I'm not able to figure out, why my solution is wrong, if it is wrong .
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 »
Thread 'A bead-mass oscillatory system problem'

Thread 'A bead-mass oscillatory system problem'

I can't figure out how to find the velocity of the particle at 37 degrees. Basically the bead moves with velocity towards right let's call it v1. The particle moves with some velocity v2. In frame of the bead, the particle is performing circular motion. So v of particle wrt bead would be perpendicular to the string. But how would I find the velocity of particle in ground frame? I tried using vectors to figure it out and the angle is coming out to be extremely long. One equation is by work...
View full post »

Similar threads

Is the Calculation of Thermal Energy in Mixing Water and Steam Accurate?
Replies
4
Views
1K
Energy required to make 2.0 kg of steam
Replies
3
Views
2K
Heat Transfer. Ice and steam in a container (easy)
Replies
2
Views
4K
Energy of a water tank with compressed air
Replies
5
Views
1K
Solving 0.02 kg Ice and 0.10 kg Water at 0°C to Melted State
Replies
8
Views
3K
Calculate energy required to heat water using a steam coil
Replies
9
Views
3K
Mixing water with steam, find equilibrim
Replies
14
Views
3K
Finding the Value of M in a Physics Homework Problem
Replies
12
Views
2K
Mixing water and ice
Replies
12
Views
947
I try to solve a thermodynamics problem on heat transfer
Replies
3
Views
2K

Hot Threads

Recent Insights

Back
Top