I think it’s c cause height is what determines gravitational potential energy
Answer:
The enthalpy change during the reaction is -199. kJ/mol.
Explanation:
![Mn(s)+2HCl(aq)\rightarrow MnCl_2(aq)+H_2(g)](https://tex.z-dn.net/?f=Mn%28s%29%2B2HCl%28aq%29%5Crightarrow%20%20MnCl_2%28aq%29%2BH_2%28g%29)
Mass of solution = m
Volume of solution = 100.0 mL
Density of solution = d = 1.00 g/mL
![m=1.00 g/mL\times 100.0 mL = 100 g](https://tex.z-dn.net/?f=m%3D1.00%20g%2FmL%5Ctimes%20100.0%20mL%20%3D%20100%20g)
First we have to calculate the heat gained by the solution in coffee-cup calorimeter.
![q=m\times c\times (T_{final}-T_{initial})](https://tex.z-dn.net/?f=q%3Dm%5Ctimes%20c%5Ctimes%20%28T_%7Bfinal%7D-T_%7Binitial%7D%29)
where,
m = mass of solution = 100 g
q = heat gained = ?
c = specific heat = ![4.18 J/^oC](https://tex.z-dn.net/?f=4.18%20J%2F%5EoC)
= final temperature = ![23.1^oC](https://tex.z-dn.net/?f=23.1%5EoC)
= initial temperature = ![28.9^oC](https://tex.z-dn.net/?f=28.9%5EoC)
Now put all the given values in the above formula, we get:
![q=100 g \times 4.18 J/^oC\times (28.9-23.1)^oC](https://tex.z-dn.net/?f=q%3D100%20g%20%5Ctimes%204.18%20J%2F%5EoC%5Ctimes%20%2828.9-23.1%29%5EoC)
![q=2,242.4 J=2.242 kJ](https://tex.z-dn.net/?f=q%3D2%2C242.4%20J%3D2.242%20kJ%20)
Now we have to calculate the enthalpy change during the reaction.
![\Delta H=-\frac{q}{n}](https://tex.z-dn.net/?f=%5CDelta%20H%3D-%5Cfrac%7Bq%7D%7Bn%7D)
where,
= enthalpy change = ?
q = heat gained = 2.242 kJ
n = number of moles fructose = ![\frac{\text{Mass of manganese}}{\text{Molar mass of manganese}}=\frac{0.620 g}{54.94 g/mol}=0.0113 mol](https://tex.z-dn.net/?f=%5Cfrac%7B%5Ctext%7BMass%20of%20manganese%7D%7D%7B%5Ctext%7BMolar%20mass%20of%20manganese%7D%7D%3D%5Cfrac%7B0.620%20g%7D%7B54.94%20g%2Fmol%7D%3D0.0113%20mol)
![\Delta H=-\frac{2.242 kJ}{0.0113 mol }=-199. kJ/mol](https://tex.z-dn.net/?f=%5CDelta%20H%3D-%5Cfrac%7B2.242%20kJ%7D%7B0.0113%20mol%20%7D%3D-199.%20kJ%2Fmol)
Therefore, the enthalpy change during the reaction is -199. kJ/mol.
If you think of it endothermic is when there is energy needed for the reaction to occur and exothermic is when the reaction releases energy
This is a physical phase change it is still water it just separated and became less and less.it stays water though