What is the ÄH of CF4 (carbon tetraflouride)? What is the ÄH of HF (hydrogen flouride)? Lastly, what is the ÄH of C2H4 (ethane gas)? Please help.

ÄH is enthalpy

Do you mean dHformation? If so you should have a table in your text that gives that along with dSo and usually dGo.

To find the enthalpy change (ΔH) of a chemical reaction, you typically need to know the specific reaction equation and the standard enthalpy of formation values (ΔHf°) for the involved compounds. Unfortunately, you have only provided the names of the compounds without any reaction equations.

However, I can provide you with the standard enthalpy of formation values for CF4, HF, and C2H4, which are needed to determine their respective enthalpy changes:

1. CF4 (Carbon Tetrafluoride):
The standard enthalpy of formation of CF4 is -680 kJ/mol.

2. HF (Hydrogen Fluoride):
The standard enthalpy of formation of HF is -272 kJ/mol.

3. C2H4 (Ethene):
Please note that C2H4 is not ethane. Ethane is C2H6. However, I can give you the standard enthalpy of formation for C2H4, which is +52.5 kJ/mol.

Remember, these values are standard enthalpy of formation values (ΔHf°) at standard conditions (298 K and 1 atm). To find the ΔH of a specific reaction, you need to use the difference in the ΔHf° values between the products and the reactants.

If you provide the balanced chemical equations for the reactions involving CF4, HF, and C2H4 that you are interested in, I can assist you in calculating the enthalpy changes.