Calculate the amount of heat needed to boil 69.7g of acetic acid, beginning from a temperature of 85.1 C Be sure your answer has a unit symbol and the correct number of significant digits.

Answer 1

To answer this question, we need to know the boiling point of acetic acid, as well as the specific heat of the acetic acid solution. Looking up these values, I find

boiling point = 118ºC

specific heat = 123 J/molº

We will use the equation q = mC∆T to find the heat needed to boil 69.7 g of acetic acid

q = heat = ?

m = mass = 69.7 g x 1 mol / 60.1 g = 1.16 moles

C = specific heat = 123 J/molº

∆T = change in temperature = 118º - 85.1º = 32.9º

Solving for q, we have ...

q = (1.16 mols)(123 J/molº)(32.9º)

q = 4694 J