Question

here is your question

chemistry class 11

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Answer 1

Here is your answer in the attachment......

Answer 2

Explanation:

When NH4NO3 is dissolved in water, it dissociates into its ions, followed by a temperature drop:

NH4NO3 -> NH4+ + NO3-

(though it's not really that relevant though ^^;)

Anyway, the heat gained or lost can be calculated using the formula

Q = mc(T2 - T1)

where

m = mass (grams)

c = specific heat capacity (J/g-K)

T = temperature (K)

Here, we'll use an assumption that the specific heat of the solution is equal to that of water, which is c = 4.184 J/g-K.

The total mass of solution is 20 + 125 = 145 grams.

Substituting,

Q = (145)*(4.184)*(286.4 - 296.5)

Q = -6127.47 J

The Q negative because heat is released in the dissociation.