I need help with this question please I\'ve tried doing it two times but it\'s s

Question

I need help with this question please I've tried doing it two times but it's still wrong I've one more try so I need a correct answer with the work step by step I want to see the math calculation because I think this where I'm messing up. Thanks

Print Calculator Periodic Table Ebook 9 Question 6 of 10 (3 points) X Incorrect X Incorrect Instant cold packs used to treat athletic injuries contain solid NH4NO3 and a pouch of water. When the pack is squeezed, the pouch breaks and the solid dissolves, lowering the temperature because of the reaction: NH1NO3 NH NO (ag) ran 25,700 J/ mol AH H,O O endothermic (a) This reaction is: O exothermic (b) What is the final temperature, in oC, in a squeezed cold pack that contains 49.9 g of NH4NO3 dissolved in 143 g of water? (Assume that the solution has the same specific heat as that of water, an initial temperature of 25.0 °C, and no heat transfer between the cold pack and the environment.) Hint: A solution is composed of a solute solvent. Number 44.85

Explanation / Answer

mass of water = 143 g

delta H = 25,700 J/mol

moles of NH4NO3 = 49.9 / 80.04 = 0.6234

delta H = - Q /n

25,700 = Q / 0.6234

Q = - 16022.36 J

specifi heat = 4.184 J / goC

Q = m Cp dT

- 16022.36 = 143 x 4.184 x (Tf - 25)

Tf = - 1.78 oC

final temperature = - 1.78 oC

Related Questions

Navigate

• Browse (All)
• Browse I
• Subjects

---