State ice athletic injuries on the field

Reference no: EM13205845

Instant cold packs, often used to ice athletic injuries on the field, contain ammonium nitrate and water separated by a thin plastic divider. When the divider is broken, the ammonium nitrate dissolves according to the following endothermic reaction:
NH4NO3(s)--->NH4+(aq)+NO3-(aq)
In order to measure the enthalpy change for this process, 1.25 g of NH4NO3 is dissolved in enough water to make 25.0mL of solution. The initial temperature is 25.8 Celcius and the final temperature (after the solid dissolves) is 21.9 Celcius.
Calculate the change in enthalpy for the reaction in kJ/mol. (use 1.0g/mL as the density of the solution and 4.18 J/g*Celcius as the specific heat capacity.)

Reference no: EM13205845

Questions Cloud

What change will americans achieve higher living standards : the composition of the federal budget toward more spending on income transfers and health care and a smaller share for national defense. Does economics indicate that this change will help Americans achieve higher living standards

State what is the mass of saccharin per tablet : All of the sulfate ion is in the precipated as barium sulfate. the mass of Barium Sulfate 0.5032g . What is the average mass of saccharin per tablet ? What is the % mass of saccharin per tablet?

State how much of the anhydrous salts : As a part of this exercise, you will need to prepare 100 mL of a 0.1 M phosphate buffer at pH 7.5, and you need to calculate the amounts of NaH2PO4 and K2HPO4 that you need to use in your buffer.

Compute the impact of a decrease in taxes equal to 100 : Solve the problem for I (income). The impact on income of an increase in government spending equal to 100. Using the original data, compute the impact of a decrease in taxes equal to 100. Explain why the results are different.

State ice athletic injuries on the field : Instant cold packs, often used to ice athletic injuries on the field, contain ammonium nitrate and water separated by a thin plastic divider. When the divider is broken

State the prepared grignard reagent : Suppose that instead of a grignard reagent with CO2 you added benzophenone (C6H5COC6H5) to the prepared grignard reagent. What product would you form?

What is the economic reasons behind cutting employees : We are in the midst of a slow growing economy in the aftermath of a severe recession. During the economic downturn many businesses laid off workers very quickly once they forecast their sales were dropping. What is the economic reasons behind cutt..

Explain grignard reagents are extremely strong bases : Grignard reagents (RMgX) are extremely strong bases and nucleophiles. Comlete the following reactions which demonstrate these two properties.

Which market structure would you classify airline industy : Given this structure, why is it that there is little price competition between carriers on the same route Why is there not more price competition If they do not choose to compete on price in most cases, how do they compete with one another What..

User Account

All Pages