haleyjoseph774
contestada

A sample of water at 100°C is converted to steam after absorbing 820 kJ of heat. How grams of H2O are contained in the sample? Assume that the molar heat of vaporization of water is 41 kJ/mol.

Respuesta :

Demiurgos
Since water is already at 100°C all the energy is used to evaporate it. 
Now we can calculate how many mols of water are evaporated with 820kJ.
[tex]N= \frac{820}{41} =20 mol[/tex]
We calculated that we got 20 mols of water evaporated. Now, all we have to do is find how many grams is a mol of water. Molar mass of water is 20.16 g/mol.
The final answer is:
[tex]m=20*20.16=403.2g[/tex]