Homework Help: Chemistry

Posted by Matthew on Monday, December 5, 2011 at 1:29pm.

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 - DrBob222, Monday, December 5, 2011 at 1:35pm
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.

Answer this Question

Related Questions

CHEM- KINETICS - Dinitrogen tetraoxide, N2O4, decomposes to nitrogen dioxide, ...
chemistry - Calculate the amount of heat required to completely sublime 24.0 g ...
chemistry - Calculate the energy in the form of heat, in kJ, required to convert...
chemistry - given the following data at a certain temperature, calculate K for ...
chem 101 - How much heat is required to raise the temperature of exactly one ...
Chemistry - Some properties of aluminum are summarized in the following list. ...
chemistry - Some properties of aluminum are summarized in the following list. ...
chemistry 106 - A 0.1589 g sample of solid magnesium is burned in a bomb ...
college chemistry - An electrical heater is used to add 19.50 kJ of heat to a ...
Chemistry - If 2.80 kJ of heat is needed to raise the temperature of a sample of...

For Further Reading

First Name:
School Subject:
Answer: