Question

calculate the heat (in kJ) required to change 40.0 g of ice at -30 degrees celcius to steam at 150 degrees celcius.

Answer 1

Answer:

HEATING AT CONSTANT PRESSURE

Step 1 would be a simple heating at constant pressure:

q1=mCPΔT,

where m is mass in g, CP is the specific heat capacity at constant atmospheric pressure in J/g∘C, and ΔT is the change in temperature until the phase change temperature.

In this case we specify Tf=25.0∘C:

q1=33.3g×4.184 J/g∘C×(25.0∘C−4.6∘C)

= 2842.27 J−−−−−−−−