Change in heat temperature

Question

Find what heat is required to change 20 gg of 16 ∘C∘C water to 100∘C∘C steam. Express your answer in calories.

Answer 1

We are dealing with two parts of the problem here.

First, we need to look at the heat required to essentially bring the temperature from 16^oC to 100^oC using the equation

q₁=mcΔT= 20.0g * 4.184J ^oC^-1 g^-1 * (100^oC - 16^oC) = 7029.12 J

Second, we need to take into account how much energy it will take to generate steam at 100^oC.

q₂=mΔH_vapor = 20.0g * (2260 J g^-1) = 45,200 J

Now we just need to add the two heat values together to get our final answer

q₁ + q₂ = 7029.12 J +45,200 J = 52,229.12 J