What is the heat in kilojoules needed to vaporize 9.00 kg of water at 100°C?

Answer 1

Large!

We want to calculate the energy of the following reaction:

#H_2O(l) + Delta rarr H_2O(g)#
This site gives the heat of vaporization of water as #40.66*kJ*mol^-1#. (There is probably a specific heat somewhere on the webz that lists the value in #J*g^-1# of substance but I could not find it. As you will see on the table, this value is quite large, and reflects the degree of intermolecular force in the liquid.)

So we multiply this value by the amount of water in moles:

#40.66*kJ*mol^-1xx(9.00xx10^3*g)/(18.01*g*mol^-1)# #=# #??*kJ#
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Answer 2

The heat needed to vaporize 9.00 kg of water at 100°C is approximately 2250 kJ.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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