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  .

c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.  

both adhesion and cohesion are attractions.

they are different in that adhesion is the force of attraction between the molecules of two different substances, whereas cohesion is the force of attraction between molecules of the same substance.

possible examples include capillary action, in which the adhesion between water and glass causes the water to rise in a narrow tube against the force of gravity.

because of hydrogen bonding, water is extremely cohesive.

this causes molecules on the surface of water to be drawn inward, which is why drops of water form beads on smooth surfaces.

hope this .