# Chemistry

posted by .

Chlorofluocarbon was once used in air conditiones as the heat transfer liquid its normal boiling point is -30 degrees C and its enthalpy of vaporization is 16J/g. The gas and the liquid have specific heat capacities of 0.61 J/g8C and 0.97 J/g*C, respectively. How much thermal energy is evolved when 10.0 g CCL2F2 is cooled from 40 degrees celsius to -40 degrees celsius

• Chemistry -

I will save myself a lot of work and let you do most of it but here is how to go about it. First, identify any phase changes (solid to liquid or liquid to gas).
q at any phase change = mass x heat vaporization (if vapor to liquid or liquid to vapor) or heat fusion (if liquid to solid or solid to liquid).
Between phase changes it is
q = mass x specific heat in that phase x (Tfinal-Tinitial).
Then add all of the qs together for the total.

## Similar Questions

1. ### chemistry

How much heat is required to vaporize 3.50L of at its normal boiling point?
2. ### chemistry

How much heat is required to vaporize 3.50L of at its normal boiling point?
3. ### Chemistry

Calculate the total quantity of heat required to convert 25.0 g of liquid CCl4(l) from 25.0°C to gaseous CCl4 at 76.8°C (the normal boiling point for CCl4)?
4. ### college chemistry

How much heat is needed to convert 2.00 kg of liquid ammonia at -40.0 oC to its vapor at -11.0 oC?
5. ### chemistry

Calculate the energy in the form of heat, in kJ, required to convert 225 grams of liquid water at 21.0 °C to steam at 115 °C. Heat of fusion = 0.333 kJ/g; heat of vaporization = 2.26 kJ/g; specific heat capacities: liquid water = …
6. ### Chemistry

In one experiment, the mass of water is 92.6 grams, the initial temperature of the water is 67.6oC, the mass of liquid nitrogen added to the water is 61.4 grams, and the final temperature of the water, after the liquid nitrogen has …
7. ### Chemistry

CFCs, or chlorofluorocarbons,were once used as refrigerants, but were banned due to their role in the depletion of ozone in our upper atmosphere. The evaporation of CFCs can be used to drive the freezing of liquid water. Given the …
8. ### Chemistry

A substance has the following properties: Heat capacities: 1.34 J/g oC (solid) 3.02 J/g oC (liquid) 2.55 J/g oC (gas) Heat of Fusion = 4.23 kJ/mole Heat of Vaporization = 23.5 kJ/mole Boiling Point = 88.5 oC Melting Point = -30.0 oC …
9. ### 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 …
10. ### chemistry

Initially you have 204 g grams of solid thallium at is at its melting point of 304ºC . How many grams of liquid thallium will be present after 476 joules of heat have been added. specific heat liquid thallium is 0.13j/g ºC; heat …

More Similar Questions