Chemistry

DrBob222, HELP!
Calculate the heat energy released when 29.7 g of liquid mercury at 25.00 °C is converted to solid mercury at its melting point.
Constants for mercury at 1 atm: Heat capacity of Hg (l) 28.0 J/Mol*K, Melting pt 234.32 k, and enthalpy of fusion 2.29 kg/mol

  1. 👍
  2. 👎
  3. 👁
  1. q1 = heat released in cooling Hg from +25C to its melting point which is -83.3C.
    q1 = mass Hg x specific heat Hg x (Tfinal-Tinitial)
    Tfinal is -83.3. Ti is 25C.

    q2 = heat released on freezing Hg.
    q2 = mass Hg x heat fusion..
    Total q = q1 + q2.
    You have given specific heat in kJ/mol and J/mol; therefore, you must convert grams Hg to mols Hg.mol = grams/molar mass.

    1. 👍
    2. 👎

Respond to this Question

First Name

Your Response

Similar Questions

  1. Chemistry!!

    How much heat is required to raise the temperature of 250.0 g of mercury 52ºC? The specific heat of mercury is 0.14 J/(gºC).

  2. chemistry

    The fluorocarbon compound C2Cl3F3 has a normal boiling point of 47.6 ∘C. The specific heats of C2Cl3F3(l) and C2Cl3F3(g) are 0.91 J/g⋅K and 0.67 J/g⋅K, respectively. The heat of vaporization for the compound is 27.49 kJ/mol.

  3. Science

    1. How much heat energy is lost by 3 kg of water when it cools from 80 degrees C to 10 degrees C? 2. A 300 g piece of aluminum is heated from 30 degrees C to 150 degrees C. What amount of heat energy is absorbed? 3. Determine the

  4. Chemistry

    1. Calculate the number of moles of carbon atoms present in 2.4g of ethanol (C2H6O). 2. What is the % Nitrogen by weight in 3.696 mol of ammonium sulfide. 3. How many atoms of mercury are present in 5.4 cubic cm of liquid mercury?

  1. chemistry

    A) How much energy is released when 25.0 g of steam condense to liquid H2O at 100°C? B) If it takes 1215J of heat to raise the temperature of water 11.C, how much does the water weigh, in grams? C) How many joules of heat does it

  2. Chem

    The amount of energy needed to heat 2.00 g mercury from 50.0°C to 85.0°C is 9.87 J. The specific heat capacity of this sample of mercury is

  3. Science

    What occurs when a substance melts? 1) It changes from solid to liquid, and heat is absorbed. 2) It changes from solid to liquid, and heat is released. 3) It changes from liquid to solid, and heat is absorbed. 4) It changes from

  4. Chemistry

    22.) The molar heats of fusion and vaporization for water are 6.02 kJ/mol and 40.6 kJ/mol, respectively, and the specific heat capacity of liquid water is 4.18 J/gC. (1) What quantity of heat is required to melt 25.0 g of ice at

  1. Chemistry

    CH4 + 2 O2 --> CO2 + 2 H2O + heat This reaction is exothermic because more energy is released when the products bond than is required to break the bonds of the reactants. The potential energy of the products (not including the

  2. chemistry

    Calculate the energy (in kJ) required to heat 25 g of liquid water from 25oC to 100.oC and change it to steam at 100oC. The specific heat capacity of liquid water is 4.18 J/goC, and the molar heat of vaporization of water is 40.6

  3. science

    The total energy of motion in the molecules of a substance is called? ?is the average amount of energy of motion in the molecules of a substance. A ? Is a thin glass tube with a bulb on one end that contains a liquid usually

  4. chemistry calorimetry

    how can i get the mass of a liquid when i'm given the heat enrgy that is added, and the specific heat of the liquid to which is added, plus the increase in temperature. q = mass x specific heat x (Tf - Ti) q is heat in Joules.

You can view more similar questions or ask a new question.