Calculate the enthalpy of combustion of butane C4H10 for the formation of H2O an

Question

Calculate the enthalpy of combustion of butane C4H10 for the formation of H2O and CO2. The enthaply of formation of butane is -126 KJ/mol. (Answer is -2660 KJ/mol) Calculate the enthalpy of combustion of butane C4H10 for the formation of H2O and CO2. The enthaply of formation of butane is -126 KJ/mol. (Answer is -2660 KJ/mol) Calculate the enthalpy of combustion of butane C4H10 for the formation of H2O and CO2. The enthaply of formation of butane is -126 KJ/mol. (Answer is -2660 KJ/mol) In Part D, you found the heat of fusion of ice. What errors are caused by doing multiple trials with very small picces of ice (0.8What errors are caused by doing multiple trials with pieces of ice that are very large?

Explanation / Answer

Solution:

a)

if small pieces --> error is essentially on "mass of cube" since the smaller the mass, the more sensible:

Q = m*C*(Tf-Ti) and Q = m*LH becomes

since m is directly proportional to latent heat and sensible heat

the smaller the mass, the more error in the mass present, therefore, more error overall

b)

if trials are done with large ice cubes --> probability of bubbles inside the cube are likely, therefore, decreases specific heat and latent heat, this error is minimal.

Also note that if ice won't metl 100%, there will be an error

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