A student dissolves 10,3 g of sodium chloride(NaCl) in 250 g of water in a well-insulated open cup. She then observes the temperature of the water fall from 23.0 °C to 22.2 °C over the course of 3 minutes. Use this data, and any information you need from the ALEKS Data resource, NaCl (s) rightarrow Na+ (aq) + Cl- (aq)
You can make any reasonable assumptions about the physical properties of the solution. Note for advanced students: it's possible the student did not do the experiment carefully, and the values you calculate may not be the same as the known and published values for this reaction.
1. Is this reaction exothermic, endothermic, or neither?
2. If you said the reaction was exothermic or endothermic, calculate the amount of heat that was released or absorbed by the reaction in this case.
3. Calculate the reaction enthalpy delta Hrxn per mole of NaCl.

1

The reaction is exothermic

2

3

Explanation:

From the question we are told that

  The mass of the sodium chloride is (NaCl ) is  

  The mass of water is  

  The initial  temperature is  

   The temperature after 3 minutes is  

   The time taken for temperature to fall is  t =  3 minutes

The  reaction is

The reaction is exothermic because the temperature fell  

Generally the mass of the solution is  mathematically represented as

=>        

=>        

Gnerally the heat energy released from the solution is mathematically represented as

Here is the specific heat of solution which for this question we would assume it is the specific heat of water which has a value of

So

Generally the number of moles of NaCl is mathematically represented as

Here   is the molar mass of NaCl  and the value is

So

=>    

Generally reaction enthalpy is mathematically represented as

it’s previous models   because when i picked that son of a gun’s answer it was wrong look for previous models because they might make it a different letter