Finding how much heat it takes to vaporize

[Skysong12]

Homework Statement

How much heat does it take to vaporize 600g of lead that is initially at 34°C?

Homework Equations

heat capacity=1.3X10²

The Attempt at a Solution

ΔT = 1750°C - 34°C
= 1716 ° C


Q= m X c X ΔT
= 0.6 X 1.3X10² X 1716
=133,848 J

Am I suppose to factor in the change of state? Is there latent vaporization?

 

[Ryomega]

You've answered your own question. Think about the analogy of turning water to vapor.

 

[rock.freak667]

Q= m X c X ΔT
= 0.6 X 1.3X10² X 1716
=133,848 J

Am I suppose to factor in the change of state? Is there latent vaporization?

Yes you are, Q = mcΔT just gives you the heat required to raise the temperature from 34°C to 1716°C.

You just need to use Q=ml_vap now and add them.

 

[PeterO]

Homework Statement

How much heat does it take to vaporize 600g of lead that is initially at 34°C?

Homework Equations

heat capacity=1.3X10²

The Attempt at a Solution

ΔT = 1750°C - 34°C
= 1716 ° C


Q= m X c X ΔT
= 0.6 X 1.3X10² X 1716
=133,848 J

Am I suppose to factor in the change of state? Is there latent vaporization?

I not sure lead will even by molten at 34^o, so you may have to melt it too. ANd is the heat capacity of solid lead and liquid lead the same?