***30
if 25.0 ml of a 0.100 m aqueous sodium hydroxide is mixed with 25.0 ml of a 0.100 m aqueous hydrochloric acid in a calorimeter at an initial temperature of 23.0 degrees celsius, what is the enthalpy change of this reaction if the final temperature reached in the calorimeter is 25.5 degrees celsius?
naoh + hcl yields nacl + h2o

Approximately 241 kJ/mol reaction.

Explanation:

How many moles of the reaction took place?

The coefficient in front of both NaOH and HCl are both one. In other words, one mole of the reaction will require one mole of NaOH and one mole and HCl.

of both NaOH and HCl are available. As a result, 0.0025 moles of the reaction would have taken place.

How much heat was produced?

Approximate volume of the solution:

.

Approximate mass of the solution:

.

Enthalpy change per mole reaction:

.

a  solution  is always transparent, light passes through with no scattering from solute particles which are molecule in size. the  solution  is homogeneous and does not settle out. a colloid is intermediate between asolution  and a  suspension. while asuspension  will separate out a colloid will not.