For countries, they were "forced" to join the conflict due to their alliance and promise to come to military support when war breaks out.
For colonies, they were "forced" to join as they were conscripted to join into their host country's military.
This was essentially why Germany, Great Britain, and Russian Empire, tried to call for a peaceful settlement between the Austrio-Hungarian Empire and Serbia, but, on failing, were forced to join the war.
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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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