Thermodynamics

[Donut.Hole]

In the formula Q=cmΔT, in which Q is the change in energy, c is the specific heat, m is the mass, and ΔT is the change in temperature, what does mΔT give you? Does it give you the amount of heat? Energy perhaps?

 

Thanks, would be a great help if you could answer.

[ydoaPs]

Well, heat IS the change in energy!

[swansont]

In the formula Q=cmΔT, in which Q is the change in energy, c is the specific heat, m is the mass, and ΔT is the change in temperature, what does mΔT give you? Does it give you the amount of heat? Energy perhaps?

 

Thanks, would be a great help if you could answer.

 

mΔT isn't meaningful without c, because c is the intrinsic property of the material.

 

Q is the heat. i.e. the energy that is transferred

[MulderMan]

Think of the units:

c (specific heat of soln): J g^-1 K^-1

 

m (mass of soln): g

 

ΔT (change in temp): K

 

So, looking at the units, multiplying c by m and ΔT, you are left with the the energy change (absorbed by the soln), in Joules.

[asecco]

This has no physical sence, the right equation is Q=mQint were Qint is the internal heat of a substance which is calculated as Qint=CpΔT.

You have only changed the order without physical sense.

[DeanK2]

Q=cmΔT can also be written as Q=(m)©(ΔT)

Q is the heat change (kJ per mol)

m is the mass of water or solvent (g)

c is the specific heat capacity of water (4.18 J per g per K)

ΔT is the overakk temperature change in K

 

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