At 1 atm, how much energy is required to heat 71.0 g of H2O(s) at -22.0 degree C to H2O(g) at...

Question:

At 1 atm, how much energy is required to heat 71.0 g of H2O(s) at -22.0 degree C to H2O(g) at 149.0 degree C? Helpful constants can be found here.

Heating Curve

The sloped regions in a heating curve suggest temperature is changing. In this case, specific heat will be used to calculate the heat transfer via the equation $$q = mC_s \Delta T $$. For the plateau regions, temperature is not changing, instead the phase of the substance is changing. Molar heat of enthalpy will be used to calculate the energy absorbed.

Answer and Explanation:

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  • 237 kJ is needed for the process.

The heating curve can be divided into five parts:

1. heating ice from -22 {eq}^oC {/eq} to 0 {eq}^oC {/eq}.

$$q=...

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Phase Changes and Heating Curves

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Chapter 6 / Lesson 3
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