Chemistry

posted by .

Calculate the heat (in kJ) required to transform 58.60 g of dinitrogen tetraoxide from a solid at a
temperature of -9.3 °C to a gas at 47 °C. Report your answer to one decimal place. Data:
Molar mass of dinitrogen tetraoxide, N2O4
= 92.011 g/mol
Melting point = -9.3 °C Boiling point = 21°C.
Enthalpy of fusion = 14.65 kJ/mol
Enthalpy of vaporization = 38.12 kJ/mol.
Molar heat capacity of the liquid phase = 142.7 J/mol•K
Molar heat capacity of the gas phase= 77.3 J/mol•K

  • Chemistry -

    Here is how you do it.
    For temperature changes in the same phase( all solid, all liquid, all gas),
    q = mass x specific heat in that phase x (Tfinal-Tinitial).

    For changing phases (from solid to liquid of liquid to gas),
    q = mass x heat fusion (at melting point)
    q = mass x heat vaporization (at boiling point)

    Then add each q together to arrive at the total Q from the starting point to the ending point.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Chem (Help!)

    I really need help answering these questions. A sample of CO2 gas with a mass of 0.30 g is placed in a 250 mL container at 400 K. What is the pressure in atmospheres exerted by this gas?
  2. chemistry

    A gas with a temperature of 31.3 oC and a volume of 109.2 L is compressed to 11.7 L. What will be the new temperature?
  3. AP chemistry

    The specified heat capacity of silver is 0.24 J/C.g. Please help with this Ap chem quastion.?
  4. AP chemistry

    The specified heat capacity of silver is 0.24 J/C.g. Please help with this Ap chem quastion.?
  5. chemistry

    given the following data at a certain temperature, calculate K for the reaction between one mole of dinitrogen oxide gas and oxygen gas to give dinitrogen tetraoxide 2N2 + O2 TO GIVE 2N2 K=1.2X10-35 N2O4 TO GIVE 2NO2 K=4.6X10-3 1/2N2 …
  6. Chemistry

    3. A liquid hydrocarbon (Cx Hy) is found to be 16.37% H by mass. A 1.158-g vaporized sample of the hydrocarbon has a 358 mL volume at 71.0 C and 749 mmHg. what is the molecular formula for this hydrocarbon?
  7. Chemistry

    Please!!! its extremely urgent. i do not need answers, only how to do it A sample of nitrogen gas (N2) kept in a container of volume 10.1 L and at a temperature of 20.3°C exerts a pressure of 3.1 atm. Calculate the number of grams …
  8. Chemistry/Calorimetry

    You buy coffee (200.0 ml) served in a styrofoam cup. You are up late working in a chemistry lab, and want to drink the coffee right away, but at 95.0 degrees C, it is too hot to drink. You like the temperature of your coffee to be …
  9. Chemistry

    Lithium metal is a highly reactive metal that oxidizes instantly in water or air. Given the data below, calculate the energy required to heat 10.0 g of Li from 150.0 °C to 200.0 °C. Molar heat capacity (solid) = 3.58 J/°C • mol …
  10. Chemistry

    Construct a cooling curve (looks the same as a heating curve) for a substance with a molar mass of 200 that has a gas phase specific heat capacity of 2.9J/g K, a boiling point of 525 K,a liquid phase specific heat capacity of 3.24 …

More Similar Questions