The heat of fusion for ammonia is 5.65 kJ/mol. How much heat in kJ is released when 1.5 mol of ammonia freezes?
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This classification of drug typically changes the brain's chemistry and reduces its ability to create its own endorphins.

How does kepler second law of planetary motion overthrow one of the basic beliefs of classical astronomy

Consider hydrogen in an excited state n = 5n=5 that emits photons to reach the ground state. there are various possible transitions other than straight to the ground state that can occur; for example, it can drop to the n = 3n=3 state followed by the n = 3n=3 to the ground state transition. which of the possible transitions will result in the emission of a photon in the visible region?