chemistry

How do you calculate the energy change required to take 45g of water vapor at 126 degrees C to ice at -25degrees C?

  1. 👍 0
  2. 👎 0
  3. 👁 74
asked by kim
  1. This is long but it is simple.
    q1 = heat removed from vapor at 126 C to vapor at 100 C.
    q1 = mass x specific heat steam x (126-100)

    q2 = heat removed to condense steam at 100 to liquid water at 100 C.
    q2 = mass x delta Hvap

    q3 = heat removed to move T from 100 to 0.
    q3 = mass x specific heat water x (100-0).

    q4 = heat removed to freeze water.
    q4 = mass x heat fusion.

    q5 = heat removed to move T from 0 to -25 C.
    q5 = mass x specific heat ice x 25

    total Q = q1 + q2 + q3 + q4 + q5

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. CHEMISTRY

    The enthalpy of cimbustion for Octane vapor, C8H18, a component of gasoline, is -5512.0kJ/mol. a. Write the equation for the combustion of Octane, including the energy term. b. Calculate the energy change when 45g of Octane burn.

    asked by cool on January 24, 2017
  2. Physics!!!Please Help!

    -Steam at 100 ¡ãC is mixed with 166.4 g of ice at ¨C32.8 ¡ãC, in a thermally insulated container, to produce water at 44.6 ¡ãC. Ignore any heat absorption by the container. -Cwater = 4186. J/(kg ¡ãC) -Cice = 2090. J/(kg

    asked by ken on April 10, 2013
  3. Physics-

    -Steam at 100 ¡ãC is mixed with 166.4 g of ice at ¨C32.8 ¡ãC, in a thermally insulated container, to produce water at 44.6 ¡ãC. Ignore any heat absorption by the container. -Cwater = 4186. J/(kg ¡ãC) -Cice = 2090. J/(kg

    asked by blur oh no on April 9, 2013
  4. physics

    A skier of mass 70kg is pulled up a slope by a motor-driven cable. The acceleration of gravity is 9.8m/s^2. How much work is required to pull him 60m up a 30.7º slope (frictionless) at a constant speed of 3 m/s? answer in units

    asked by puff puff on September 17, 2006
  5. Chemistry

    Energy is released when 100kg of steam at 150.0°C and standard pressure changes to water at 60.0°C. Calculate the total energy change. Energy change= heat to cool steam to 100C + heat to change steam to water + heat change for

    asked by J.M. on September 23, 2006
  6. Thermodynamics

    The initial state consists of a closed system containing one mole of super-heated liquid water at 115°C and 1 atmosphere pressure. The immediate surroundings are also at 115°C and 1 atmosphere pressure. The change in state is

    asked by Becca on February 23, 2013
  7. Chemistry

    "Energy is released when 100 kg of steam at 150 degrees Celsius and standard pressure changes to water at 60 degrees Celsius. Calculate the total energy change". I used q=mct to find the energy required to change to 100 degrees

    asked by Stuck on February 17, 2010
  8. Chemistry

    If you can show me an example of one problem, I have no idea how to approach this. Calculate where the number 40.67 came from. Use the Clapeyron-Clausisus equation. Assuming that delta H vap does not change with temperature, this

    asked by Angel on February 26, 2012
  9. Science

    Calculate the quantity of energy required to change 3.00 mol of liquid water to steam at 100°C. The molar heat of vaporization of water is 40.6 kj/mol

    asked by Emily on March 25, 2013
  10. chemistry

    The Clapeyron-Clausisus Equation is ln(P2/P1) = dHvap/R [(1/T1)-(1/T2)]. Assuming that dHvap doesn't change with the temperature, this equation relates the change in vapor pressure and temperature to a substances enthalpy of

    asked by isabelle on February 18, 2012

More Similar Questions