# 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?

Jul 31, 2017

Approx. $37 \cdot k J$........

#### Explanation:

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

${H}_{2} O \left(l\right) + {\Delta}_{1} \rightarrow {H}_{2} O \left(g\right)$

Where ${\Delta}_{1} = 2260 \cdot k J \cdot {g}^{-} 1$........

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......

${H}_{2} O \left(g\right) \rightarrow {H}_{2} O \left(l\right) + {\Delta}_{1}$

And a $16.5 \cdot g$ mass of steam condenses, and so we take the product.......

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