Calculate the amount of heat in kilojoules reased when 50 of steam at 125 C are converted to 50 grams of ice at -125 C.
AHsteam = m * Cp steam * At
q1= 50g * 4.184 J/g C * (125-100)C= 5.23 x 10^J
q2= m * AH
50g * 5230 J/g = 2.61 x 10^5 J
q3= 50g *4.184 J/g C * (100-0)C= 2.10 x10^4 J
q4= 50g * 20920 J/g = 1.04 x 10^6 J
q5 = 50g * 4.184 J/g C * (0-125)= -2.61 x 10^4 J
AH total = 1 + 2 + 3 + 4 + 5 = 1.30 x 10^6 J endothermic
please let me know if it correct
1 answer
It is not correct. You did not use the correct specific heats for steam, nor for ice. In addition, you did not use the correct values for Latent heats of fusion or vaporization.
3 answers