Chemistry

Mercury, with a freezing point of -38.8°C, is the only metal that is liquid at room temperature. How much heat energy (in joules) must be released by mercury if 1.30 mL of the metal is cooled from room temperature (18.0°C) to -38.8°C and then frozen to a solid? (The density of mercury is 13.6 g/cm3. Its specific heat is 0.140 J/g · K and its heat of fusion is 11.4 J/g.)

Is this the type of question where you have to draw a heating curve and get your information after you draw the heating curve? What do I have to do after that?

  1. 👍 0
  2. 👎 0
  3. 👁 57
asked by Amalia
  1. Actually you don't need to draw a heating curve although I don't know that there is anything wrong with doing that. There are two equations that will solve any of these problems that go from one temp to another. ONe is for a phase change and the other is when there is no phase change.
    For heat released going from 18 to -38.8, you have
    q1 = mass x specific heat x (Tfinal-Tinitial). That will take you from 18 (room T) to the freezing point of Hg BUT IT ALWAYS A LIQUID IN THAT RANGE.
    Then you want to freeze it. That formula is for a phase change.
    q2 = mass x heat fusion
    (Note: for the phase change from vapor to liquid, or the reverse, the formula is almost the same; i.e., q = mass x heat vaporization/condensation)
    Then you just add the qs together to obtain the total q.

    1. 👍 0
    2. 👎 0
  2. THANK YOU!!!!!!

    1. 👍 0
    2. 👎 0
    posted by Jane

Respond to this Question

First Name

Your Response

Similar Questions

  1. Chemistry

    The freezing point of mercury is -38.8°C, is the only metal that is liquid at room temperature. What quantity of heat energy, in joules, must be released by mercury if 2.00 mL of mercury is cooled from 23.0°C to -38.8°C and

    asked by Lindy on April 22, 2011
  2. Chemistry

    The freezing point of mercury is -38.8°C, is the only metal that is liquid at room temperature. What quantity of heat energy, in joules, must be released by mercury if 2.00 mL of mercury is cooled from 23.0°C to -38.8°C and

    asked by Lindy on April 23, 2011
  3. chemistry

    The freezing point of mercury is -38.8°C, is the only metal that is liquid at room temperature. What quantity of heat energy, in joules, must be released by mercury if 2.00 mL of mercury is cooled from 23.0°C to -38.8°C and

    asked by Lindy on April 23, 2011
  4. math

    metal mercury at room temperature is a liquid. melting point is 39 degree celsius.freezing point of alcohol is 114 degree celsius.how mu7ch warmer is the melting point of mercury than the freezing point of alcohol

    asked by sai on May 21, 2015
  5. math

    Mercury is a metal, which is liquid at room temperature. Its melting point of alcohol is 39 Celsius the freezing point of alcohol is-114 Celsius. how much warmer is the melting point of mercury than the freezing point of alcohol?

    asked by Raina on July 26, 2015
  6. math

    1. A submarine was suituated 800 feet below sea level. If it ascends 250 feet, what is it new position 2. Metal mercury at room temperature is a liquid. Its melting point is -39°C. The freezing point of alcohol is-114°C. How

    asked by tsunayoshi on July 31, 2014
  7. Portions and integers

    I need help please. Mercury is a metal that is liquid at room temperature. Its melting point of -39 degrees Celsius. The melting point of isopropyl alcohol is -89 Celsius. (Part A) In the context of this problem, what does zero

    asked by Jessica on November 30, 2016
  8. science

    Mercury, a metal that is liquid at room temperature, has a density 13.5 times the density of water. How many pennies could your boat hold if we were floating it in mercury instead of water?

    asked by Samantha on January 14, 2014
  9. Chemistry

    A student breaks a thermometer and spills most of the mercury (Hg) onto the floor of the laboratory that measure 15.2 m long, 6.6 m wide and 2.4 m high. a) (1 mark) Calculate the volume of the room in m3 and L. b) (2 marks) If the

    asked by Anonymous on December 13, 2017
  10. chemistry

    the density of liquid mercury is 13.6 g/cm^3. how many moles of mercury are there in 1 litre of the metal?

    asked by shish on June 17, 2014

More Similar Questions