Chemistry

Some properties of aluminum are summarized in the following list.


normal melting point 658°C
heat of fusion 0.395 kJ/g
normal boiling point 2467°C
heat of vaporization 10.52 kJ/g
specific heat of the solid 0.902 J/g°C

(a) Calculate the quantity of energy required to heat 1.75 mol of aluminum from 17°C to its normal melting point.

(b) Calculate the quantity of energy required to melt 1.37 mol of aluminum at 658°C.

(c) Calculate the amount of energy required to vaporize 1.36 mol of aluminum at 2467°C.

asked by Charles
  1. a)
    q = mass x specific heat x (Tfinal-Tinitial).

    b)
    q = mass x heat fusion.

    c)
    q = mass x heat vap

    posted by DrBob222
  2. This is how I'm doing part A. I'm told it's the wrong answer, but I can't figure out what I'm doing wrong. I'm hesitant on going to parts B and C until I understand part A.

    Part A:

    Step one: I changed the mols of Al to grams.

    13.9mol Al * (26.9815g Al / 1mol Al) = 47.2176g Al

    Step two: I plugged the numbers into the Q = s * m * change in T

    Q = (0.902 J/g*C)(47.2176g Al) ( 641C)
    Q = 27300KJ = 2.73 * 10^4KJ

    So the answer to part A is 2.73*10^4kJ

    Again, I'm told I'm wrong here. Any help would be appreciated thanks!

    posted by Charles
  3. Forget it... I got it thanks!!!!!

    posted by Charles
  4. I answered this below where you showed your work. I think the problem is that you have kJ and it is actually J.

    posted by DrBob222

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