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calculate the enthalpy change in calories when 45.2 g of steam at 100 degree C condenses to water at the same?
temperature. What is the enthalpy change in joules?
how do you do this/ what equation would you use
2 Answers
- 1 decade agoFavorite Answer
45.2g multiplied by the heat of vaporization for water (because steam is water) which is 2260 J / g gives you 102.15 kiloJoules or 102,150 Joules.
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- 5 years ago
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.
