# 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.

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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=...