# Calculate the amount of heat required to convert 45.0 g of water at 43.0 ∘C to steam at 100.0 ∘C.?

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Express your answer to three significant figures and include the appropriate units.

Express your answer to three significant figures and include the appropriate units.

##### 1 Answer

#### Explanation:

First, the water must be heated to 100 degrees celcius and then the 100 degree water must be turned into steam.

Using the equation

We know

m=45 g

c=4187 Joules per kilogram- the specific heat capacity of water.

Hence we find

Now we must turn the water into steam. This is done by increasing the potential energy of the water without changing its temperature using something called **Specific latent heat of vaporisation of water**- which is the energy amount required to convert a a unit mass of water into steam at constant temperature.

It is given by the equation

According to Wikipedia the value of the latent heat of vaporisation of water is:

Plugging it in to the equation:

So the total energy change from both of these coverstion are: