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Table 5: Calculated resultsTrialTrial 2Trial 3AverageHeat capacity of calorimeter (Jr'C)32.0731,628.,330.66Enthalpy of neutralization (kJImol)Enthalpy of disso...

Question

Table 5: Calculated resultsTrialTrial 2Trial 3AverageHeat capacity of calorimeter (Jr'C)32.0731,628.,330.66Enthalpy of neutralization (kJImol)Enthalpy of dissolutlon of calcium in acid (kJImol)Enthalpy of dlssolution of calclum In water (kJImol)

Table 5: Calculated results Trial Trial 2 Trial 3 Average Heat capacity of calorimeter (Jr'C) 32.07 31,6 28.,3 30.66 Enthalpy of neutralization (kJImol) Enthalpy of dissolutlon of calcium in acid (kJImol) Enthalpy of dlssolution of calclum In water (kJImol)



Answers

In a coffee cup calorimeter, $1.60 \mathrm{g}$ of $\mathrm{NH}_{4} \mathrm{NO}_{3}$ is mixed with $75.0 \mathrm{g}$ of water at an initial temperature of $25.00^{\circ} \mathrm{C}$ After dissolution of the salt, the final temperature of the calorimeter contents is $23.34^{\circ} \mathrm{C} .$ Assuming the solution has a heat capacity of $4.18 \mathrm{J}^{\circ} \mathrm{C}^{-1} \mathrm{g}^{-1}$ and assuming no heat loss to the calorimeter, calculate the enthalpy change for the dissolution of $\mathrm{NH}_{4} \mathrm{NO}_{3}$ in units of $\mathrm{k} \mathrm{J} / \mathrm{mol}$.

Using the information provided. Let's calculate the entropy change for the dissolution of ammonium nitrate. Well, first I determined the massive solution. Yeah. Which is equal to the mass of the ammonium nitrate 1.60 g plus the mass of water which is 75.0 g. This is equal to 76.6 grams. The change in temperature is equal to 23.34°C -25.00°C Change in temperature is equal to -1.660°C.. And we have our specific heat capacity. Therefore we can calculate the energy here is equal to M C delta T. The mass of the solution is 76.6 g. Capacity is 4.18 jules per gram degree Celsius. And belted, he is -1660°C.. The energy here is equal to minus 531 0.51 jules. So this is the equal to the energy yeah. Lost by the solution. But this is equal to the M. V. P. Of the reaction. Mhm. Yeah. Now we have to find the number of moles of ammonium nitrate. So we have 1.6 year old g of ammonia matrix molar mass of ammonium nitrate is 8.0 g in one more. This is equal to .0199 moles of ammonium nitrate. And now the and to be changed For the dissolution of NH four and all three. So the entropy change is equal to um So energy is absorbed here. So this is we'll use a positive value here. This is- or positive. 531 5 1 jules Over a .0199 moles. And this would be equal to entropy change for dissolution here. Yeah, so we'll do this too. Um 26,000 709 jewels per mole. Or if we can refuse to kill a jules, this would be 26.7 individuals promoting. This would be the MPA P. Change for the dissolution of ammonium nitrate.

Solution for birth. A total mass of solution is equal to 1.6 plus 75 is equal to 76.6 gran and heat capacity of solution is equal to 4.18 Killer Joel per gram per Kelvin. Temperature change on the all dirty is equal to 25 minus change. The three point 34 is equal to 1.66 Kelvin heat of solution Delta Edge. Is it better to unknown? So, Delta Edge, is it? Well, too massive solution here. Capacity of the solution in tow. Change in temperature is it were to 76.6. Multiply 4.18 multiply 1.66 is equal to 531.5 Kill you, Joel and solution for part B and Toby off. Hydration is equal to minus 63 Kill you, Joel. Divided by mall kill a jewel paramo and an therapy off solution is equal to 26 point six. Killer Joel Carmen A lead. This energy is equal to on no and lady synergy is equal to and tell me off solution plus hydration energy is equal to minus 6 30 plus 26.6 is equal to minus six 56 point six killers all hormone

In part a. Let's first solve for the moles of ammonium nitrate. We're told that we have 1.6 grams molar mass. 80 grams per mole, which we yield 0.20 Malls of the ammonium nitrates question tells us the mass of the H 20 is 75.0 grams. Change in temperature. 23 0.34 degrees Celsius. Uh, subtract 25 degrees Celsius, not leaves us with a temperature change of negative 1.66 degrees Celsius. Let's calculate heated the surroundings using this formula here, the mass 75.0 grams constant for water is 4.18 Jules program Degrees Celsius. Temperature change was minus 1.66 degrees Celsius. He did. The surroundings works out to be negative. 520 jewels, which is equal to negative 0.5 to 0 cure Jules. The heat of the reaction is equal to negative heat of the surroundings, so that is equal to positive 0.5 to 0 killer jewels. And now, to calculate the MPA p the reaction, the MP will be the 0.5 to 0 killer Jules, divided by the 0.20 moles We calculated initially to yield us with an EMP api of 26 killer Jules per mole part B will use the info beauty calculate the lattice. Sanji, Using this formula here, the MPA P is equal to the lattice energy plus the, uh, P hydration Told that. Well, first, we just calculated the delta each which is 26 killed, Jules per mall unknown is the lattice energy, and the p of hydration is 630. Killa Jules Ramo solving this for the unknown Lattice energy yields us, eh? Number of negative. 604 Killa Jules per no.

In part a. Let's first solve for the moles of ammonium nitrate. We're told that we have 1.6 grams molar mass. 80 grams per mole, which we yield 0.20 Malls of the ammonium nitrates question tells us the mass of the H 20 is 75.0 grams. Change in temperature. 23 0.34 degrees Celsius. Uh, subtract 25 degrees Celsius, not leaves us with a temperature change of negative 1.66 degrees Celsius. Let's calculate either the surroundings using this formula here, the mass 75.0 grams constant for water is 4.18 Jules program Degrees Celsius. Temperature change was minus 1.66 degrees Celsius. He did. The surroundings works out to be negative. 520 Jules, which is equal to negative 0.5 to 0 cure jewels. The heat of the reaction is equal to negative heat of the surroundings, so that is equal to positive 0.5 to 0 killer jewels. And now, to calculate the MPA p the reaction, the MP will be the 0.5 to 0 killer jewels divided by the 0.20 moles we calculated initially to yield us with an MP of 26 killer jewels per mole. Part B will use the info beauty calculate the lattice sounds Using this formula here, the MPP is equal to the lattice energy, plus the, uh, little P hydration Told that Well, first, we just calculated the delta each which is 26 killed Jules per mall unknown is the lattice energy, and the P of hydration is 630 killer jewels. Pramono Solving this for the unknown lattice energy yields us a number of negative 604 kila jewels per more.


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