Calculate the heat change in calories when 45.2 g of steam at 100 degrees cel condenses to water at the same..

Question

Calculate the heat change in calories when 45.2 g of steam at 100 degrees cel condenses to water at the same temp. What is the heat change in joules?

Calculate the heat change in calories when 45.2 g of steam at 100 degrees cel condenses to water at the same temp. What is the heat change in joules? Show your work.

Answer 1

c = 540 C/g = 2260 J/g
45.2*540 = 24,408 Calories
45.2*2260 = 102.152 kJ

Answer 2

you need to calculate the energy it takes for the phase change from H2O(g) -> H2O(l) to occur which is just (moles)x(KJ/mol factor) Then you do normal thermodynamic calculations for H2O(l) going from 100C to 0C and then you need to calculate the energy it takes for the phase change H2O(l) -> H2O(s) to occur which is the same type of equation as before but with a new value for the (KJ/mol) factor.