How much energy is released when 16.5 g of steam is condensed at 100°C if the heat of vaporization is 2260 J/g?

1 Answer
Jul 31, 2017

Answer:

Approx. #37*kJ#........

Explanation:

We are given data for water's vaporization......

#H_2O(l) + Delta_1rarrH_2O(g)#

Where #Delta_1=2260*kJ*g^-1#........

Note that by convention, EXOTHERMIC REACTIONS are reported with a negative sign, whereas, as here, ENDOTHERMIC reactions are reported with a positive sign.

Now we interrogate the physical reaction......

#H_2O(g) rarr H_2O(l) + Delta_1#

And a #16.5*g# mass of steam condenses, and so we take the product.......

#16.5*gxx-2260*kJ*g^-1=??*kJ#.