Enthalpy change is the difference between energy used and energy gained. The change in enthalpy of the liquid mercury is 0.0231 kJ.
<h3>What is the enthalpy change?</h3>
Enthalpy change is the difference between the energy used to break chemical bonds and the energy gained by the products formed in a chemical reaction.
The enthalpy change is given by,

and,

Given,
Mass of the liquid mercury (m) = 11.0 gm
The specific heat of mercury (c) = 0.14 J per g per degree Celsius
Temperature change = 15 degrees Celsius
Enthalpy change is calculated as:

Therefore, 0.0231 kJ is the change in enthalpy.
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I think the answer you are looking for is D.
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Answer : The mass of
is, 295.323 grams
Solution :
First we have to calculate the moles of
.

Now we have to calculate the moles of NaBr.
The balanced chemical reaction is,

From the balanced reaction we conclude that
As, 2 moles of
react with 2 moles of 
So, 2.87 moles of
react with 2.87 moles of 
Now we have to calculate the mass of NaBr.


Therefore, the mass mass of
is, 295.323 grams