posted by .

The specific heat of water is at 4.184J/g * degree C. How much heat is evolved, or absorbed, when the temperature of 9.00 mol of liquid water cools from 38 degrees C to 28 degrees C?

How do I start this problem

  • Lauren -

    q = mass x specific heat x delta T.
    You will need to change the mols of water to grams.

  • Lauren -

    wouldnt it be 4.184J/g * degrees C

    so 4.184 J/ 162 g H2O * 10 degrees C = ?

  • Lauren -

    mols = grams x molar mass
    9.00 mols H2O x (18.015 g/mol) = ?? g H2O
    q = g H2O x 4.184 J/g*C x delta T
    and delta T = (Tfinal - Tinitial) = (38-28) = -10.
    The answer will be a negative number which means that heat is evolved (and not absorbed).

  • Lauren -

    -6783.72 J

  • Lauren -

    ok. Actually, if we round the numbers, the last 2 should be a 3. However, if you are concerned about the number of significant figures, the 9.00 limits them to three; therefore, the -6383.73 J would be written as -6.38 x 10^3 Joules.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Physics

    Spent steam from an electric generating plant leaves the turbines at 120.0 degrees Celsius and is cooled to 90.0 degrees Celsuius liquid water by water from a cooling tower in a heat exchanger. How much heat is removed by the cooling …
  2. Chemistry

    A quantity of ice at 0.0 degrees C was added to 33.6 of water at 21.0 degree C to give water at 0.0 degrees C. How much ice was added?
  3. Chemistry

    if the temperature of a 500.0g sample of liquid water is raised to 2.00c how much heat is absorbed by the water?
  4. Chemistry

    80.0 mL of water is initially at room temperature (22degrees C). A chilled steel rod at 2 degrees C is placed in the water. If the final temperature of the system is 21.2 degrees C, what is the mass of the steel bar?
  5. chemistry

    given the following info for water molar heat of specific heat capacity of liquid water 4.18 j/g degrees calculate the total quanity of heat evolved when 10.0g of steam is condensed,cooled,and frozen to ice at -50 degrees
  6. chemistry

    a 100.00 mL sample of water has an initial temperature of 20.0 degrees C. The water is heated, and after 5 minutes its temperature is 50 degrees C. approximately how much energy was absorbed by the water?
  7. Science

    1. How much heat energy is lost by 3 kg of water when it cools from 80 degrees C to 10 degrees C?
  8. chemistry

    A 94.7 g sample of silver (s= 0.237 J/(g x Degree C)), initially at 348.25 Degrees C , is added to an insulated vessel containing 143.6 g of water (s=4.18 J/(g x Degree C)), initially at 13.97 Degrees C. At equilibrium, the finial …
  9. chemistry

    If the temperature of a 500.0-g sample of liquid water is raised 2.00c how much heat is absorbed by the water?
  10. Chemistry

    Heat from burning a fuel is absorbed by a copper calorimeter. The calorimeter has a mass of 81.34 g and contains 200.0 g of water initially at 21 degrees Celsius. a) How much heat was absorbed by the calorimeter and the water if the …

More Similar Questions