Chemisty

posted by .

In an experiment, 23.0 g of ice at –25°C is converted into steam with a temperature of 124°C. How much heat is required for the process? The following data may be of use:
vap = 2260 J/g; Hfus = 334 J/g; Cp(ice) = 2.06 J/g • °C; Cp(water) = 4.18 J/g • °C;
Cp(steam) = 1.99 J/g • °C

  • Chemisty -

    q1 = heat to move ice from -25 C to zero C.
    q1 = mass ice x specific heat ice x delta T.

    q2 = heat to melt ice (change H2O solid to H2O liquid at zero degrees.)
    q2 = mass ice x heat fusion.

    q3 = heat to move liquid water from zero degrees C to 100 C.
    q3 = mass x specific heat water x delta T.

    q4 = heat to convert liquid water at 100 C to steam at 100 C.
    q4 = mass x heat vaporization.

    q5 = heat to move steam from 100 C to 124 C.
    q5 = mass x specific heat steam x delta T.

    Total q = q1 + q2 + q3 + q4 + q5.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Chem...one more time

    Ok ok I swear after this I'm done asking questions. It's just that I'm trying so hard to understand all of this, but sometimes it just doesn't make sense to me! So here we go: How many J of energy must be removed when 124.0 g of steam, …
  2. chemistry

    (i) Explain why the freshman criterion for sponteneity: G=H-TS < 0 is just a statement of the second law of thermodynamics (that the entropy of the universe always increases). Now apply this concept to some …
  3. Chemisty

    How much heat energy is released to surrounding when 15.0 g of water at 35°C is converted into ice with a temperature of -45°C?
  4. Chemisty

    In an experiment, 230 kJ of heat energy are released to the surroundings when steam is converted to liquid water. Calculate the number of grams of water condensed. The following data may be of use: vap = 2260 J/g; Hfus …
  5. Chemisty

    How many grams of ice at -6.1C can be completely converted to liquid at 27.4C if the available heat for this process is 4.60×10^3 kJ ?
  6. science/math

    A juice processing operation uses steam to heat the fruit juice up to a temperature of 96̊C prior to packaging it in drink boxes. They need to heat 3,250 kg of apple juice (10.5% solids) from an initial storage temperature of …
  7. AP Chem

    Need help with this practice problem. I got the values for the gas to liquid and liquid to solid. Don't know how to do the rest?
  8. AP Chem

    Need help with this practice problem. I got the values for the gas to liquid and liquid to solid. Don't know how to do the rest?
  9. Physical Science

    A 5.00 kg block of ice at –25 oC is converted to steam at 125 oC. How much energy (in kilojoules) is expended in this process?
  10. chemistry

    17. Calculate H for the following reaction using Hess law H2 (g) + Br2 (g) → 2 HBr (g) Experimental information 2 H+ → H2 H -436.4 kJ 2 Br- → Br2 H -192.5 kJ 2 H+ + 2 Br- →2 HBr H …

More Similar Questions