Ammonia nh3 is used as a refrigerant. at its boiling point of -33, the standard enthalpy of vaporization of ammonia is 23.3 kj/mol. how much heat is released when 50.0 g of ammonia is condensed

Answer is:  68.385 kJ heat is released when ammonia is condensed.

m(NH₃) = 50.0 g.

n(NH₃) = m(NH₃) ÷ M(NH₃).

M(NH₃) = Ar(N) + 3Ar(H) · g/mol.

M(NH₃) = 14 + 3.031 · g/mol = 17 g/mol.
n(NH₃) = 50.0 g ÷ 17.031 g/mol.
n(NH₃) = 2.935 mol; amount of ammonia.
Hvap = 23.3 kJ/mol; the heat of vaporization for ammonia.
Q = Hvap · n(NH₃).
Q = 23.3 kJ/mol · 2.935 mol; energy.
Q = 68.385 kJ.

in chemistry, adhesion and cohesion are attractive forces that exist between molecules. they hold the molecules together from each other. they are different in that adhesive force exists between molecules of different substance while cohesive force happens between molecules of same substance.

adhesion between water and glass causes water molecules at the edge of water and glass interface to climb up the wall in a narrow glass tube. this is called capillary action. cohesion is what gives glass its shape and causes water to form a droplet.