The heat absorbed when 2.8 mol NH₄NO₃ is dissolved in water is 71.96 kJ.
<h3>What is heat?</h3>
Heat is the transportation of energy to or from a thermodynamic system.
By the formula of heat

Where n = moles
Delta Hrxn is molar heat
q = heat
Putting the values in the equation

Thus, the heat absorbed when 2.8 mol NH₄NO₃ is dissolved in water is 71.96 kJ.
Learn more about heat
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I don’t know for sure but I think the answer is probably B.
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Explanation:
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<em>Hope this helps! Please correct me if I am wrong.</em>