Answer: Density means the compactness of an object
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I can’t see the question? Is there something going on wrong.
Answer:
28
Explanation:
it states that the atom is neutral, meaning the number of electrons and protons are the same. so if there are 13 electrons, there are 13 protons. And the mass number is neutrons plus protons. So 13+15 is 28
Enthalpy of reaction: -41.15 kJ
Entropy change: -42.36 kJ