4. How many moles of NH4NO2 would be required to form 25 grams of N2 in the
following reaction?
NH4NO2
N2 +
2 H20
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Explanation:

NH₄NO₂     =       N₂    +    2H₂0

1 mole                1 mole

25 grams of N₂ = 25 / 28 moles of N₂  because molecular weight of N₂ is 28.

25/ 28 moles = .8928 moles.

from the reaction above we find that 1 mole of N₂ will be formed by 1 mole of NH₄NO₂  

so .8928 moles of N₂ will  require .8928 moles of NH₄NO₂  .

i think the answer is terrae but not 100 percent sure. ▓▬▬ §

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.