You have taken apart a cold pack from the soccer team First Aid kit. Inside, you

Question

You have taken apart a cold pack from the soccer team First Aid kit. Inside, you find a packet containing 28.05 g of NH4CI (formu weight- 53.45 g) and 121 mL (121 g); of water. You dissolve the salt in the water. Assume that the specific heat capacity of the solution is 4.184 J/goC. a. What is the value of q associated with this process? NH4CI (s) NH4+ (aq) CIT (aq) AH 15.2 kJ/mol You are correct. Tries Your receipt no. is 159-7010 (7 Previous b. What is the final temperature of the solution if the initial temperature of the cold pack is 24.00C? Tfinal (OC) 39.76 Submit Answer Incorrect. Tries 1/2 Previous Tries

Explanation / Answer

q = m x s x (T2 - T1 )

q = 7980 J

m = 121 + 28.05 = 129.05 g

s = 4.184 J/0C.g

T2 = ?

T1 = 24.00 0C

Since the reaction is endothermic reaction, temperature of the solution decreases. So,

7980 = 129.05 x 4.185 x ( 24 - T2 )

=> T2 = 9.22 0C

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