latent heat

Question

How to answer this question. Pl help

 

1)How much energy is required to raise the temperature of the water to 100 degrees celsius.

Answer 1

Thanks, Pooja.  With that information, we can use the expression relating heat transfer (Q) to temperature change (ΔT) in a substance, in the case where there is no phase change.

 

Q = mcΔT

 

where 

 

m = mass of material

c = specific heat of material (a value you are usually either given or can look up in a table in your textbook or online)

 

For pure water, the specific heat (for energy in joules) is about 4186 J/(kg C)  (joules per kilogram per degree Celsius)

 

So, by "how much energy," they mean thermal energy, aka heat transfer.  So you are solving for Q above.

 

You have m, and can get a value for c (such as the one I gave above).  And you can calculate ΔT, which is the difference between the temperature you are starting at and the one you are ending at.

 

After that, it is just plug-and-play, so let me know if you have any other questions, or would like to check an answer.  I hope that helps some!